In order:
Epcot. They love the characters. Marie, Donald, Sleeping Beauty, and Snow White. My son is fascinated by the trains just outside of Germany. They both love the "donald duck ride" in Mexico, and the Nemo ride.
Animal Kingdom. They love the safari ride, and the walking trails, especially the bats, tigers, and "monkeys". They could happily spend all day at The Bone Yard.
DHS: Disney Junior show, Little Mermaid show, characters to meet, Honey I Shrunk the Kids playground, Cars meet & greet, and Pizza Planet.