What: a huge wooden complex in Stow, Ohio. Castles, play areas, sand pits.
Where: Stow, Ohio. 3870 Darrow Road.
What's good: pretty much everything. Parking is close by and accessible. There are public restrooms and ADA picnic tables. Enclosed, so you don't need to worry about someone bolting (a la Ellie).
What's bad: it's not right around the corner from the Cleveland area, but with Route 8 open and improved, it's a quick 40 minute drive, and so worth it.
Grade: A