I encourage you to visit the places I've mentioned if you're ever in Pittsburgh. They're not "parks" in the sense of mowed lawns and baseball fields (Pittsburgh has lots of those too, though). These parks contain legitimate woods in the heart of the city, Frick most especially.
I looked up the parks when I left that comment and saw that they have forests. But I am driving at the difference between visiting a park once or twice a week, probably with parental supervision / transportation (young free-roaming children in American cities is largely a thing of the past, the cops will scoop up your kid and possibly accuse you of neglect) vs running around in the woods unsupervised for 12 hours a day, every day of summer.
