For kids your age, I would book these meals:
Crystal Palace (Winnie the Pooh and Friends)
Minnie's Seasonal Dine (Mickey and Friends) and/or Garden Grill (Mickey, Pluto, Chip and Dale)
Storybook Dining at Wilderness Lodge (Snow White and Dwarves) and/or breakfast at Trattoria al Forno (Ariel & Rapunzel with their princes)
For rides, I would FP+
MK - Peter Pan, Haunted Mansion, and Winnie the Pooh
Epcot - Spaceship Earth, Frozen Ever After, Nemo or the Frozen Princess Meet
AK - Festival of the Lion King, Kilimanjaro Safaris, Na'vi River Journey
HS - Toy Story Midway Mania, Muppets Show, and I honestly don't know what else because HS isn't great for littles.
Have a great time! It's such a fun age because they really still believe in the magic.