I was there May of 06 and had the most fun at Animal Kingdom and Epcot. I'm a total foodie, so the international area of Epcot had the most to offer The safari ride at Animal Kingdom as well as the way it was divided into different sections of the world with different attractions for each region was really enjoyable.
If you want to hit rides, I'd recommend Universal Studios with a preference to the new section (can't remember the name). Seaworld was worth a day as well.
If you are renting a car, you might look into the Dali Museum in Tampa Bay. As a fan of surrealism in general and Dali in particular, nothing beat seeing this painting full size (I swear it was 8-10 feet tall)