Don't miss Mickey's Philharmagic! My 4 year old would have stayed there all day!
Other favorites were Peter Pan, Flying Carpets, Teacups, Buzz. We enjoyed touring Mickey and Minnie's houses too. And meeting Ariel in her grotto.
I'd skip Stitch (scary), the cars that you drive (what's that called?), Hall of Presidents. My 4 year old didn't like any of those.
Depending on how brave she is, Splash Mountain, BTMR. Mine loved both.
Hope that helps some!
Angie