Here are some of my favorite things to do in Florida, otherthan what you've listed:
Airboat Rides - Boggy Creek Airboat Rides in Poincicana are a lot of fun! Located off Poincicana Blvd. and Hwy 192, just outside Kissimmee.
Beaches! My favorite beach is Siesta Key, located in Sarasota, Florida - approximately 1 hr 45 minutes south of Orlando. By far, the softest, whitest-purest sand in the nation. Just a nice nice beach. I also enjoy Cocoa Beach near Kennedy.
Speaking of Kennedy - visit Kennedy Space Center! That place is amazing!
If you would like help planning your trip or if you would just like to read up on some fun tips and ideas that are updated monthly, visit my Disney Vacation Services Website, I'm All Ears at:
http://im-all-ears-disney-vacation-services.blogspot.com/
I focus on Disney trips - but I help with other Florida vacations as well.
Have a great time!