The boys and I have embarked on the KaBOOM! Summer Playground Challenge this summer as well. Basically, you go outside, and play. Simple, right? We are fortunate that we live in such a beautiful area with an abundance of parks, skate parks, walking trails, green space, state parks, and wonderful places to play outside. So go outside and play. Get dirty. Find a new park. Have a picnic. And above all else, have some fun!
If you are in the Seattle area, this is a great resource: Best Parks in Seattle
If you are on the Eastside (Kenmore, Bothell, Kirkland, Redmond, Sammamish, Issaquah) check this out: My Parks and Recreation
Peek A Boo