Hi Yenifer,
Welcome to the Disney Parks Moms Panel! My favorite park to visit with toddlers is the Magic Kingdom. Magic Kingdom Park is home to classic Disney attractions like "it's a small world" and
Dumbo The Flying Elephant. There is so much to see and do in the six lands of the Magic Kingdom that your son will have plenty of ways to get out his energy while you explore the park. Our family spends most of our time at Magic Kingdom Park in Fantasyland and the recently expanded
New Fantasyland. New Fantasyland's Storybook Circus area is home to Dumbo The Flying Elephant, which offers an air-conditioned circus-themed play area to keep children entertained before you take flight. My boys love it!
Your son can also play at
Casey Jr. Splash 'N' Soak Station in Storybook Circus. This is a great place to cool off on a warm summer day. There are several play areas similar to Casey Jr. Splash 'N' Soak Station around the other theme parks, like
The Boneyard at Disney's Animal Kingdom. These areas are perfect for little ones to run and climb. I hope this helps you with your planning. Please be sure to send any further questions about visiting the Walt Disney World Resort to me. I enjoy helping families with little ones plan their Disney vacations.
Have a magical day,
Bob