One of the nicest places in Pike County is Childs Park - it is a state park off Silver Lake Road / Park Road in Dingmans Ferry. Totally free. Beautiful waterfalls and nice hiking. Not supposed to swim but people do it anyway....
Great place for a picnic (no grills, bring your own) and an afternoon by the water.
Did I say - FREE?
Here's a short movie from when my family went there in the spring. It's much prettier in the lush summer, but the spring runoff made the falls even more robust....
http://www.youtube.com/watch?v=R6eutESgJ_8You can't beat the price!! I like it a lot better than waterfalls you PAY to see...