Here’s a wonderful site recently brought to our attention: a travelogue and survey of the playgrounds of West Philadelphia, http://zoraplays.com.
“In January 2012, my daughter Zora and I visited 31 playgrounds for the 31 days of the month as part of the 8th Annual Fun A Day Project. Zora & I biked to all the playgrounds. They are all within a mile and a half of my house in West Philly.”
(The entry on the Clark Park Tot Lot is at http://zoraplays.com/?p=178.)