Since people are all familiar with it I'll just offer these nuggets:
All the rides are packed so expect to spend a good chunk of the day standing in line. That said Space Mountain is worth the wait and the Matterhorn is a nice one with shorter wait times and a fun ride.
Don't sleep on the teacups either, they're still an oddly fun ride.
The Best Rides:
1. Space Mountain
2. Splash Mountain
3. Matterhorn
4. Thunder Mtn Railroad
5. Indiana Jones
more