Flying over Orlando is a great buzz...you can fly over "the mouse house" for about 100 USD. Check out the airfields in Kissimmee (about 10 miles from Disney). Also NASA is worth a visit.
Don;t forget SeaWorld, and if you're a golfer there are fantastic Disney-run golf courses all around the area. Not cheap but they will rent you all the gear.
Definatley head down to Tampa o go to Bush Gardens, it's part of the sea world company and it's an amazing safari park with a very up to date theme park included. Excellent fun both for those who love the fast rides and those who like a quiet stroll around the zoo.
The 4 main disney theme parks (Disney-MGM studios, EPCOT Centre, Magic Kingdom, Animal Kingdom), the smaller Disney water parks, Universal Studios and Islands of Adventure.. the list is endless. Check travel brochures for more