Hi there Lindsay!
Thanks for visiting the Disney Parks Moms Panel.
I recently visited with my almost-3-year-old nephew, so I can easily tell you that you'd have a great time visiting
Disney's Hollywood Studios with your son. There are some great Playhouse Disney and Disney Pixar attractions and shows that he is sure to enjoy. I'll outline a few of the "must-see" attractions you'll want to consider for your little guy!
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Honey, I Shrunk the Kids Movie Set Adventure is a great, play area that your little guy will enjoy running around in
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Muppet*Vision 3D is a fantastic show for all ages
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Toy Story Midway Mania! is a fantastic attraction for Toy Story lovers of all ages
Additionally, there is some great Entertainment at Hollywood Studios such as:
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Disney Junior - Live on Stage!
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Meet Lightning McQueen and Tow Mater near Streets of America for a great photo opportunity
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Lights, Motors, Action! Extreme Stunt Show with an appearance by Lightning McQueen
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Meet the Stars of Disney Junior at Animation Courtyard
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Disney Junior Play 'n Dine featuring Disney Junior Characters at Hollywood & Vine (Breakfast and Lunch time - advance reservations are required by calling (407) WDW-DINE)
My kids have both loved Animal Kingdom Park from a young age, however I think your little guy might find Hollywood Studios more 'entertaining' at his current age if you need to decide between the two.
I hope this information is helpful to you Lindsay. If you have more questions, please don't hesitate to write me back. I'd love to hear from you again.
Wishing you a simply Magical time at Walt Disney World!
Kirsten