As someone who has lived in Orlando for a good 35 years, I can honestly say that there is a plethora of things to do here.
You've got a week, we have 7 theme parks. If you are a fan of beer, I can't recommend Epcot enough; it's one of my favorite places.
As was mentioned before, Kennedy Space Center is fun if you are interested in the space program. They have several IMAX films that are very interesting.
I cannot personally recommend Legoland, unless you have very young kids.
For a taste of home, I would definitely recommend Raglan Road. It's an Irish Pub at Downtown Disney with great food and beer.
