If you want to stretch your legs and breathe in some fresh mountain air, head out to Zugspitze for a bird's-eye view of Grainau. It's also full of great shops and restaurants, so you can spend the afternoon having a wander.
If seeing the sights is on your list of things to do, head to Zugspitze Summit Cross— just one of the landmarks located 4.3 mi (6.9 km) from central Grainau.