Hi Marci,
Here are my top two suggestions for your excited Playhouse Disney fan:-
1/
Disney Junior - Live on Stage at Disney's Hollywood Studios gives preschoolers the chance to sing, dance and play with characters from Mickey Mouse Clubhouse, Handy Manny, Little Einsteins & Jake and the Never Land Pirates.
2/ Make an Advanced Dining Reservation for the Disney Junior Play n' Dine at
Hollywood & Vine in Disney's Hollywood Studios. Handy Manny, June & Leo from the Little Einsteins and Special Agent Oso appear during breakfast and lunch at this restaurant.
You will also be able to meet Mickey Mouse & his pals at several locations throughout the four Disney theme parks.
Be sure to check the Character Greetings section of the Times Guide as you enter each park for up to date information on where and when characters can be found during each day of your visit.
Wishing you a magical trip!