Hello, Preston!
Thanks so much for stopping by the Moms Panel with your question. Your first Walt Disney World vacation is just around the corner, and I'm sure you must be getting so excited!
My little Mousketeer is 6 years old, and even when she was younger, we found that we still needed to spend 2 full days at Magic Kingdom Park to really take in all of the great preschool-friendly rides and attractions that this theme park has to offer. Because there are so many things that your young children can experience at this park, you may find that this will quickly become their favorite, too! If you choose to spend 2 days at Magic Kingdom Park, then I would recommend a full day each at Epcot and Disney's Animal Kingdom Theme Park to round out the 4 days of your trip.
Epcot offers a few rides that even your youngest can enjoy, as well as a fun
Caribbean Coral Reef Aquarium, interactive play area at
ImageWorks - The "What If" Labs,
Kidcot Fun Stops at each of the World Showcase countries, and great opportunities to meet with favorite Disney Princess characters in their native lands.
Your children may also enjoy taking a walk on the wild side at Disney's Animal Kingdom Theme Park. This park offers an exciting ride through an African savanna on Kilimanjaro Safaris, as well as exotic animal exploration trails that you can explore at your own pace. This park also offers excellent live stage performances, like Festival of the Lion King and Finding Nemo-The Musical.
I hope you and your family have a magical first visit to Walt Disney World, Preston! Please don't hesitate to stop back by the Moms Panel if you have any additional questions. Hope to see ya real soon!