Hi Friend,
Thank you so much for visiting the Disney Parks Moms Panel with your question. I think that all of the Walt Disney World theme parks have attractions that are appropriate for a three-year-old!
At
Magic Kingdom, you will likely find yourself spending a lot of time in Fantasyland. Attractions such as it's a small world and Peter Pan's Flight are wonderful for preschool-age children. At
Epcot, try attractions like Journey into Imagination with Figment and Spaceship Earth. Also at Epcot, you can take advantage of the Kidcot Fun Stops as you tour World Showcase. At the Kidcot Fun Stops, your child can color Duffy the Bear at the various country pavilions.
Disney's Hollywood Studios offers little ones the chance to laugh, dance, and sing along with characters from Disney Junior at Disney Junior - Live on Stage!, and also to see some classic Disney stories live with entertainment such as Voyage of the Little Mermaid and Beauty and the Beast - Live on Stage. Finally, at
Disney's Animal Kingdom, guests of all ages can enjoy seeing animals such as lions and elephants on Kilimanjaro Safaris. Also you can take a ride on the Wildlife Express Train out to Rafiki's Planet Watch where, among other things, your child can pet animals at Affection Section.
Be sure to check out the Walt Disney World page about planning your
Walt Disney World vacation with young children for more thoughts on this topic. I hope that these thoughts are helpful for you, Friend. Please do let us know if you have any further questions!