Clifford Park, Biddeford
My kids asked to come here for the skate park, but we discovered oh so much more. In addition to the small skate/scooter park, there are 5.1 miles of wooded trails here that include large areas of rock/ledge. If your kids are anything like mine, they will have a field day rock climbing and parkouring their way through these trails. This would also be a really great place for mountain biking. Oh, and did I mention the story book path for our younger hikers? And the waterfall?