We have one entire day of our vacation in Sept set aside for non parks. We love the parks but we want to experience other things too. Like power boats, disney marketplace, maybe the world wide sports complex....something cool and wonderful. Any ideas???? 

Lots of great ideas here. Thanks guys....you are all awesome! 
Also, there's a cute little mini-golf place (Fantasia Gardens?), which might be fun if it's not too hot. 