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The ISO by Castle

3.5 star property
Kapaa beachfront resort with outdoor pool and restaurant

Choose dates to view prices

Bask in the sun at The ISO by Castle, a beachfront resort with white sand shores and crystal-clear waters. Enjoy snorkeling, an outdoor pool, bike rentals and a refreshing water dispenser.

Reviews

8.4 out of 10
Very good

Popular amenities

  • Bar
  • Air conditioning
  • Non-smoking

Main amenities (9)

  • On the beach
  • Restaurant and bar/lounge
  • Outdoor pool
  • Air conditioning
  • Garden
  • Water dispenser
  • Limited hour front desk
  • Snorkeling
  • Bike rental

Feel at home (6)

  • Refrigerator
  • Private bathroom
  • Television
  • Garden
  • Coffee/tea maker
  • Blackout drapes/curtains
The current price is $219
$294 total
includes taxes & fees
Dec 16 - Dec 17

Room options

Available filters for rooms
Showing 17 of 17 rooms

View all photos for Ocean View (1st - 3rd Upper Floors, stair access only

Laptop workspace, blackout drapes, Internet, bed sheets

Ocean View (1st - 3rd Upper Floors, stair access only

8.6 out of 10
Excellent
(63 reviews)

Highlights

Balcony
Air conditioning
Free cribs/infant beds
Refrigerator
Flat-screen TV
Blackout drapes/curtains
Ceiling fan
Private bathroom
  • 27 sq m
  • Ocean view
  • Sleeps 3
  • 2 Double Beds OR 1 King Bed

View all photos for Ocean Front View (1st - 3rd Upper Floors, stair access only)

Ocean Front View (1st - 3rd Upper Floors, stair access only) | Laptop workspace, blackout drapes, Internet, bed sheets

Ocean Front View (1st - 3rd Upper Floors, stair access only)

7.8 out of 10
Good
(30 reviews)

Highlights

Balcony
Air conditioning
Free cribs/infant beds
Refrigerator
Flat-screen TV
Blackout drapes/curtains
Ceiling fan
Private bathroom
  • 27 sq m
  • Ocean view
  • Sleeps 3
  • 2 Double Beds OR 1 King Bed

View all photos for Deluxe Room, Ocean View (2nd Floor - stair access only)

Deluxe Room, Ocean View (2nd Floor - stair access only) | Living area | 42-inch flat-screen TV with cable channels, TV

Deluxe Room, Ocean View (2nd Floor - stair access only)

7.8 out of 10
Good
(14 reviews)

Highlights

Balcony
Separate sitting area
Air conditioning
Free cribs/infant beds
Refrigerator
Flat-screen TV
Blackout drapes/curtains
Ceiling fan
  • 27 sq m
  • Ocean view
  • Sleeps 4
  • 1 King Bed and 1 Double Sofa Bed OR 2 Double Beds

View all photos for One Bedroom Ocean View (2nd Floor, stair access only)

One Bedroom Ocean View (2nd Floor, stair access only) | Private kitchenette | Fridge, coffee/tea maker

One Bedroom Ocean View (2nd Floor, stair access only)

9.0 out of 10
Wonderful
(2 reviews)

Highlights

Balcony
Separate dining area
Separate sitting area
Air conditioning
Free cribs/infant beds
Kitchenette
Refrigerator
Flat-screen TV
  • 54 sq m
  • 1 bedroom
  • Ocean view
  • Sleeps 4
  • 1 King Bed and 1 Double Sofa Bed

View all photos for Beach House Suite (2nd floor, stair access only)

Beach House Suite (2nd floor, stair access only) | Living area | 42-inch flat-screen TV with cable channels, TV

Beach House Suite (2nd floor, stair access only)

10.0 out of 10
Exceptional
(1 review)

Highlights

Balcony
Separate dining area
Separate sitting area
Air conditioning
Free cribs/infant beds
Kitchen
Refrigerator
Dishwasher
  • 59 sq m
  • 1 bedroom
  • Ocean view
  • Sleeps 4
  • 1 King Bed and 1 Queen Sofa Bed

View all photos for Partial Ocean/Pool View (1st - 2nd Upper Floors, stair access only)

Partial Ocean/Pool View (1st - 2nd Upper Floors, stair access only) | View from room

Partial Ocean/Pool View (1st - 2nd Upper Floors, stair access only)

9.2 out of 10
Wonderful
(9 reviews)

Highlights

Balcony
Air conditioning
Free cribs/infant beds
Refrigerator
Flat-screen TV
Blackout drapes/curtains
Ceiling fan
Private bathroom
  • 27 sq m
  • Partial ocean view
  • Sleeps 3
  • 2 Double Beds OR 1 King Bed

View all photos for Premium Ocean Front View (1st - 3rd Upper Floors, stair access only)

Premium Ocean Front View (1st - 3rd Upper Floors, stair access only) | Laptop workspace, blackout drapes, Internet, bed sheets

Premium Ocean Front View (1st - 3rd Upper Floors, stair access only)

10.0 out of 10
Exceptional
(1 review)

Highlights

Balcony
Air conditioning
Free cribs/infant beds
Refrigerator
Flat-screen TV
Blackout drapes/curtains
Ceiling fan
Private bathroom
  • 27 sq m
  • Ocean view
  • Sleeps 3
  • 1 King Bed

Beach House Suite (2nd Floor, Stair Access Only)

  • Sleeps 4

One Bedroom Ocean View (2nd Floor, Stair Access Only)

  • Sleeps 4

Premium Ocean Front View (1st-3rd Upper Floors, Stair Access Only)

  • Sleeps 2

Run Of House

  • Sleeps 2

Partial Ocean Pool View 1st-2nd Floor

  • Sleeps 3

Ocean View (1st-3rd Upper Floors, Stair Access Only

  • Sleeps 3

Partial Ocean/Pool View (1st-2nd Upper Floors, Stair Access Only)

  • Sleeps 3

Ocean Front Room

  • Sleeps 3

Ocean View Room

  • Sleeps 3

Deluxe Ocean View

  • Sleeps 4

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8.6 out of 10, Excellent, 1,010 reviews
The price is $178
$243 total
includes taxes & fees
Jan 4 - Jan 5, 2026
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About the neighborhood

Map
4-796 Kuhio Hwy, Kapaa, HI, 96746

What's nearby

  • Waipouli Beach - 3 min walk - 0.3 km
  • Coconut Marketplace - 14 min walk - 1.2 km
  • Fuji Beach - 15 min walk - 1.3 km
  • Lae Nani Beach - 3 min drive - 1.5 km
  • Wailua Beach - 3 min drive - 1.9 km

Getting around

  • Lihue Airport (LIH) - 14 min drive

Restaurants

  • ‪McDonald's - ‬4 min walk
  • ‪Starbucks - ‬6 min walk
  • ‪Waipouli Deli & Restaurant - ‬3 min walk
  • ‪Sensei Sushi Bar And Grill - ‬14 min walk
  • ‪Taco Bell - ‬8 min walk

About this property

The ISO by Castle

Situated by the ocean, The ISO by Castle is a great choice for a stay in Kapaa. The outdoor pool is a great spot to take a dip, and guests can grab a bite to eat at The Bullshed Restaurant, which serves local cuisine and is open for dinner. Other highlights include a bar/lounge and a garden. Fellow travelers love the pool and helpful staff.

At a glance

DONE

Hotel size

    • 78 units
    • Arranged over 3 floors
DONE

Arriving/Leaving

    • Check-in start time: 3:00 PM; Check-in end time: 10:00 PM
    • Minimum check-in age: 18
    • Check-out time is 11 AM
    • Late check-out subject to availability
DONE

Special check-in instructions

    • The front desk is open daily from 7:00 AM - 10:00 PM
    • Front desk staffed during limited hours
    • Information provided by the property may be translated using automated translation tools
DONE

Required at check-in

    • Credit card, debit card, or cash deposit required for incidental charges
    • Government-issued photo ID may be required
    • Minimum check-in age is 18
DONE

Pets

    • Pets not allowed
DONE

Other information

    • Smoke-free property

Property amenities

Food and drink

  • Restaurant
  • Bar/lounge
  • Water dispenser

What to do

  • On the beach
  • Yoga classes
  • Snorkeling
  • Golfing nearby

Services

  • Front desk (limited hours)
  • Bicycle rentals

Facilities

  • 5 buildings/towers
  • Garden
  • An outdoor pool
  • Water dispenser

Room amenities

Be entertained

  • 42-inch flat-screen TV
  • Cable TV channels

Home comfort

  • Air conditioning
  • Ceiling fan
  • Coffee/tea maker

Sleep well

  • Blackout drapes/curtains
  • Bed sheets provided

What to enjoy

  • Balcony

Freshen up

  • Private bathroom
  • Shower/tub combination
  • Free toiletries
  • Towels

Stay connected

  • Laptop-friendly workspace

Food and drink

  • Refrigerator

Special features

Dining

The Bullshed Restaurant - This beachfront restaurant specializes in local cuisine and serves dinner only. Guests can enjoy drinks at the bar.

Fees & policies

Mandatory fees

You'll be asked to pay the following charges by the property at check-in or check-out. Fees may include applicable taxes:
  • Resort fee: USD 35.38 per accommodation, per night
  • Resort fee inclusions:
    • Additional inclusions
    • Fitness/yoga classes
    • Newspaper
    • Parking
    • Self parking

Optional extras

  • Late check-out can be arranged for an extra charge (subject to availability)

Policies

This property has outdoor spaces, such as balconies, patios, terraces which may not be suitable for children. If you have concerns, we recommend contacting the property prior to your arrival to confirm they can accommodate you in a suitable room.
Only registered guests are allowed in the guestrooms.
This property does not have elevators.
Guests can rest easy knowing there's a smoke detector on site.
This property accepts credit cards and debit cards. Cash is not accepted.
Credit cards accepted: Visa, Mastercard, American Express, Discover
State tax ID - W-34434930-01

Also known as

Castle Mokihana
Castle Mokihana Hotel
Castle Mokihana Hotel Kapaa
Castle Mokihana Kapaa
Mokihana Of Kauai Hotel Kapaa
ISO. Island. Sky. Ocean. Resort Kapaa
ISO. Island. Sky. Ocean. Resort
ISO. Island. Sky. Ocean. Kapaa
ISO. Island. Sky. Ocean.
ISO Sky Ocean Resort Kapaa
The ISO by Castle Kapaa
The ISO by Castle Resort
The ISO. Island. Sky. Ocean.
The ISO by Castle Resort Kapaa

Frequently asked questions

Does The ISO by Castle offer free cancellation for a full refund?

Yes, The ISO by Castle does have fully refundable room rates available to book on our site. If you’ve booked a fully refundable room rate, this can be cancelled up to a few days before check-in depending on the property's cancellation policy. Just make sure to check this property's cancellation policy for the exact terms and conditions.

Is there a pool at The ISO by Castle?

Yes, there's an outdoor pool.

Are pets allowed at The ISO by Castle?

Sorry, pets aren't allowed.

What are the check-in and check-out times at The ISO by Castle?

Check-in start time: 3:00 PM; Check-in end time: 10:00 PM. Check-out time is 11 AM. Late check-out is available for a charge (subject to availability).

What is there to do at The ISO by Castle and nearby?

Have fun during the warmer months with activities such as snorkeling. Additional recreation onsite includes yoga. Enjoy a swim in the outdoor pool or use the resort's other amenities, which include a garden.

Are there restaurants at or near The ISO by Castle?

Yes, The Bullshed Restaurant offers beachfront dining and local cuisine.

Does The ISO by Castle have any outdoor private spaces?

Yes, every room features a balcony.

What's the area around The ISO by Castle like?

The ISO by Castle is a short 10-minute walk from Waipouli Beach and 16 minutes' walk from Coconut Marketplace. Travelers give top marks for the resort's prime location.

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The ISO by Castle Reviews

Reviews

8.4

Very Good

8.8/10

Cleanliness

8.4/10

Staff & service

8.0/10

Amenities

8.2/10

Property conditions & facilities

8.4/10

Eco-friendliness

Popular mentions

Room
Service staff
Location
View
Ocean
Restaurant
Breakfast
Beach
Ocean view
Biking

What guests liked

  • The property's beach location offers stunning ocean views, direct access, and a serene atmosphere. (40 reviews)
  • The pool was a highlight, described as wonderful, nice, great, and inviting, with many guests enjoying its location and cleanliness. (26 reviews)
  • The on-site restaurant offered great food and cocktails, with one guest even dining there three times during their stay. (6 reviews)
AI Sparkle IconFrom real guest reviews summarized by AI.

Reviews

10/10 Exceptional

The room was clean and comfortable. Staff were helpful. We most enjoyed the hotel's location which was quiet, felt tucked away but very walkable and convenient to nearby restaurants, foodtruck, and stores. The oceanfront was absolutely beautiful and watching sunrise every day was a highlight. of our tripsunshine
Jana, 6-night trip

8/10 Very good

Great location, reasonable price with nice side perks---bikes water pool yoga etc. Property is clean but very dated.
Dave, 5-night trip

10/10 Exceptional

Clean room. Beach access
John, 3-night trip

10/10 Exceptional

It's a great hotel, near the airport and the main road to go anywhere in Kauai. I will definitely stay there again.
Hallei, 4-night trip

8/10 Very good

Nice place to stay that is a quick walk or drive to several other areas.
Danna, 6-night trip

10/10 Exceptional

It's a very good safe place to stay.
Mengqing, 4-night trip

8/10 Very good

Very good location, easy to get food from Safeway and
Ying, 7-night trip

8/10 Very good

Great location nice restaurant attached to Hotel. No beach for swimming though but very nice location on the water. Nice pool very quiet location.
Paul, 2-night trip

10/10 Exceptional

Amazing
Siham, 3-night trip

10/10 Exceptional

Had a lot of amenities like a nice grab and go breakfast as well as bikes you could rent out. They also did morning yoga and had a great pool.
Kiarah, 2-night trip

8/10 Very good

Great location, bikes were nice for the bike path, breakfast,grab and go was helpful.. property was older but well kept.
Donna, 4-night trip

10/10 Exceptional

Good but the restaurant attached was not the best
James, 3-night trip

10/10 Exceptional

amazing view nice hotel
Irvin, 4-night trip

10/10 Exceptional

Amazing place to stay in Kauai! 10/10 recommend. Friendly staff, prime location, beautiful grounds, clean rooms!
Hayley, 3-night trip

10/10 Exceptional

Our stay was great! The ISO is in a great location within walking distance to several beaches and food options.
Kyle, 2-night trip

10/10 Exceptional

Great location, friendly staff, good amenities
Celina, 4-night trip

8/10 Very good

The staff were very friendly and very accommodating to make our stay enjoyable. Our room was quite comfortable with a kitchen and separate bedroom although there were a few areas needing minor repair and painting.
CHUNMEI XIE VAN, 7-night trip

8/10 Very good

closwe3d to conference
Inessa, 6-night trip

10/10 Exceptional

Excellent location very nice staff , our ac unit was faulty However with it only being a 2 night stay it wasn’t worth the hassle, they were extremely friendly I’m sure if I pushed the issue they would have dug into it, also was fully booked
Codey, 2-night trip

10/10 Exceptional

The ISO is a great affordable option to some of the other overblown resorts in the area. Rooms are clean and comfortable, staff is helpful, and the hotel is conveniently located close to some great restaurants and island excursions. While it may not have the bells and whistles of nearby options, it has a pool, a great continental breakfast, and EVERY room is ocean-view.
Brian, 7-night trip

6/10 Good

Na
christi, 7-night trip

10/10 Exceptional

Great views outside the balcony
DWARAKESH, 3-night trip

10/10 Exceptional

Nothing to dislike like about the stay. Will recommend for friends for certain who want to visit Kauai. Experience was amazing, along with the staff.
Steve, 2-night trip

6/10 Good

I like the property it’s close to a beach and nice views and if you want, you could just swim in the pool. Too bad there wasn’t a jacuzzi, but it wasn’t a deal breaker. The room was okay, the bed was comfortable and the room was clean. The restaurant on premises was great! The hotel was close to shopping and places to eat. All in all, it was a great place to stay!
Al, 2-night trip

10/10 Exceptional

Quiet, serene and conveniently located.
Natania Delfin, 3-night trip