If you are doing DisneyWorld, you will need at LEAST one day in each of the four parks...Magic Kingdom, MGM Studios, EPCOT and Animal Kingdom. You can find maps of the parks online and you should definitely make reservations at restaurants in the parks ahead of time if you plan to eat there so you don't waste time waiting. Downtown Disney is great, too. We always stay on the property, so I am not sure about other Orlando stuff, but I know there are other studios that have things there, and Sea World, the Space Center, etc. LOTS to do!