Run up the hill, run down the hill. Struggle up again, stumble down. Crawl up, roll down. Nobody goes back for fourths (unless it's sledding season). But everybody has done it at least once. Why? Because it's there. Somebody should put that in letters on an archway on 13th Street. That, and "Watch out for decapitation by Frisbee." As for the actual playground at Camel's Back, hordes of squealing children heartily endorse it daily.
Second Place: Settlers Park
Third Place: Ann Morrison Park