Hi, Christine!
How awesome to be planning an 8-day trip to Walt Disney World with your 2 younger boys and one "older" boy! Thee are definitely some special places for unstructured free-play time in the four theme parks.
It sounds like you're already familiar with
The Boneyard interactive play area in DinoLand, U.S.A. at Disney's Animal Kingdom Theme Park. I guarantee your boys will have fun climbing, digging and exploring in The Boneyard! At Disney's Hollywood Studios, be sure to check out the
Honey, I Shrunk the Kids Movie Set Adventure play area which offers lots of climbing and sliding fun in a dedicated 11,000-square-foot space.
Next stop: Epcot! One of the special features of the Epcot International Flower & Garden Festival is the Land of Oz Garden, an interactive kids' play zone inspired by the new Disney film "Oz the Great and Powerful". This play area is really eye-catching with bright colors and interesting organic shapes - and there's plenty of spaces for climbing, sliding, crawling and swinging!
At Magic Kingdom the absolute best place to do some free-play exploring and climbing is
Tom Sawyer Island in Frontierland. The island is accessible by log raft and the opportunity for adventure is endless - there are forts, secret caves, tunnels and even a watch tower!
I hope I've given you some helpful suggestions for places to enjoy some unstructured down time. It's smart planning to make time for a break each day, whether in the park itself or back at your resort!
Wishing you a
magical vacation!
Kimberly