Hi Michelle!
This is such a difficult question! All of the parks are amazing! My first response would be Magic Kingdom but if you wanna get the most out of each park, check out the
park hours for the days you will be visiting. If you are staying in a Disney Resort, you are going to want to take advantage of the Extra Magic Hours. This would allow you to enter a certain park early or stay late. I would recommend that you visit the park offering the most hours per day, this would allow you more time to enjoy the attractions, parades, stage shows and fireworks. Keep in mind that the most popular park is Magic Kingdom and the crowd levels are higher on a weekend versus a weekday. Now going back to the fun, here are some of the attractions my little one loves: "Peter Pan's Flight", "Buzz Lightyear's Space Ranger Spin", the "Magic Carpets of Aladdin", "It’s a Small World”, and "Dumbo the Flying Elephant". You can also find plenty of
character meet and greets thoughout this park! There is no better feeling than to see your kids light up with excitement when they see their favorite characters! Ultimately, I gotta say that the best thing is the Wishes Nighttime Spectacular Fireworks! The music, the fireworks and the flying Tinker Bell are out of this world!
If you visit the other parks, I would recommend "The Seas with Nemo and Friends" at Epcot and "The Boneyard" play area at Disney's Animal Kingdom; “Disney Junior – Live on Stage!” and "Toy Story Midway Mania" at Disney's Hollywood Studios! Your kids would love these!
It has been a real pleasure assisting you Michelle! If there are any other questions you may have, please feel free to send them my way!
Yael