Treat Playground is 0.9 mi (1.5 km) from central Hays, why not stop by during your stay. Want to stretch your legs some more? Head to Custer Island Park and Hays Dog Park, both nearby.
If museums are on your list of things to see in Hays, then you might want to head to Kansas Merci Boxcar. If you want to see more of the museums in Hays, Fort Hays State Historic Site isn't far either.