Here are my top 3 in each category.
Rides
Hulk
Mummy
Men in Black
Attractions
Horror Makeup Show
Posedien's Fury (this may spark debate about whether PF is a ride
or an attraction!)
Aniamal Planet Live!
Restaurants
Margaritaville
Finnegans
The Kitchen
That being said, I know my DS would have other top picks--he has been going to UO since he is 7 years old. His favorite eating is NBA City, Margaritaville and Turkey Legs at the Parks! When he was 7, he was not interested in the Hulk and Mummy was not open. I would have to say that his favs that trip were Jaws, Spiderman and River Adventure. Of course that was "back in the day"...before MIB, Shrek and Mummy. At the ripe old age of 13, I'd have to say his current favs are Hulk, Dueling Dragons and MIB. Food is as mentioned above, and as far as attractions, his favs are Horror Makeup Show, Fear Factor Live and Matt Hoffman's Crazy Freakin' Stunt Show (Matt Hoffman's is not there all the time.)
Have a great time. And let us know what your top picks are when you return.