Drink lots of water.
I enjoyed the food and Ankershus in Norway. I've heard nothing but good things about Boma.
I've heard the Explorer's Club in Downtown Disney is lots of fun.
I've heard of complaints about how thin the walls are at the All Star Resorts - noisy. But as SMcS said, you can't beat the price.
If you can, eat in the Castle at MK. It's very cool. Princess dining or not, you're in the freakin' castle. It's cool.
Ralphie recommends GatorLand. I have no comment on it.
Be prepared for MK's stroller and wheelchair calvacade. Lots more than DL. Wear ankle guards.
Look for the living statues in Paris.
Don't miss Illuminations.
Don't do the boat ride at Animal Kingdom. Bo-ring. But do the safari ride. It's awesome.
Take a good look at the Tree of Life. So much detail. One of my favs.
Don't forget about the American Adventure at Epcot. I did. Dang it, dang it.
Do the Tiki Room at MK. The show isn't that great, but there's a cool AA god that appears. She's neat.