Depends what you want to do. Japan has tons of historical sites/museums everywhere. There is probably quite a few near where you are staying. More than likely there are also spas/onsen, tours etc nearby. You can check this, site which has reviews and recommendations.
Okinawa Prefecture Vacations and Tourism: 599 Things to Do in Okinawa Prefecture | TripAdvisor I can also ask some of my friends what they suggest if you want.