Conservation area/gameland. Not all the roads are marked on the map. If you go by the 2 smaller ponds, there's a road to the left. It'll take you to the bigger pond. Which is quite private and very crazy.
There was more action before PennDot removed the toilets a while back. The only maintenance now is cutting the grass. There are a couple old old picnic areas concealed by foliage which are good for sexual encounters. The one behind the gazebo is best.