Here's things I suggest not to miss!
-Illuminations in Epcot. This is THE BEST show in Disney, hands down.
-Typhoon Lagoon & Blizzard Beach (if you like water parks, that is)
If you only have time to do one, blizzard beach is better.
-Not-to-be-missed-rides:
Epcot: Mission Space, Soarin, Spaceship Earth
MGM: Tower of Terror, Rockin Rollercoaster, Star Tours, Muppet 3D
MK: Thunder Mountain Railroad, Splash Mountain, Space Mountain, Haunted Mansion, Buzz Lightyear, Pirates of the Carribean (reopens July 1st)
Animal Kingdom: Expedition Everest, Dinosaur, Kilimanjaro Safari
-If you like video games, Disney Quest is really fun
-If you're into nightlife, check out pleasure island
-Best restaurants:
A lot of people really like the restaurants in the world showcase. Make it a point to go to at least one of these during your stay. Mexico's San Angel Inn provides a really cool atmosphere. None of the restaurants exhibit 5-star caliber, but if you're willing to spend more money on your meal, try the California Grill on top of the Contemporary, or the Coral Reef in Epcot. In the MK, the Crystal Palace serves a wonderful buffet, with characters present! But my all-time favorite place to eat in Disney is the Rainforest Cafe (AK & DD).
-Ride on the monorail
-If you're staying at a Disney Resort, set aside an afternoon to check out the Grand Florridean.
-In the MK, take the time to appreciate Mainstreet, as this is where it all started.