I'll make a few suggestions, based upon the assumptions that you will have a rental car, and are flying out of Orlando. We did Kennedy Space Center after our trip--sort of on the way back to Orlando. Don't know if you would have the time to make it work--our flight was at 10 pm, so we had lots of time. Lots of people on this site recommend going to Downtown Disney. There is also Belz Outlet which has great bargains (including Disney items, etc.) There is the Orlando Science Center which sounds really fun.