Walt Disney World
Universal Studios - Orlando
here are some transportation ideas (that don't involve brooms or Floo Powder, sadly).
Kennedy Space Center
If you're a space nerd like we are, or want to make the trip a more educational experience (y'know, for the kids...really...), Cape Canaveral and the Kennedy Space Center is about an hour from Orlando. As with Universal, there are a few transportation options if you don't want to rent a car. Although the Shuttles are no longer in use, a little birdie has told us that there is currently a rocket launch scheduled for 13 January (the Monday after the wedding). Launches are notoriously unpredictable, though, so check frequently for updates as the date gets closer.