hopefully there are no lines cause if not it would be a long day to ride these rides only a couple times but i would have to say:
Magic Kingdom:Splash Mountain
Epcot:Test Track (with lines) Soarin (if there are no lines)
Animal Kingdom:Everest
Hollywood Studios: Toy Story Mania
MK - Haunted Mansion (would be Carousel of Progress, but I fear it is truly too dated for my child's generation).
EP - Nemo followed by Turtle Talk w/ Crush....lunch at Coral Reef.
HS - Toy Story Mania (my Dad cannot ride R'Roller Coaster).
AK - The Lion King is worth the price of admission to AK...