I can tell you that I've ridden some fantastic single-track in and around Ohiopyle. However, I've only ridden with my uncle who knows the area. I, unfortunately, can't really help you with any directions. However, if you ask around, someone should point you in the right direction.

There is an area right by Ohiopyle called "Bear Run". There is some great single-track there, and sometimes there is even a map or two @ the trail head.

Good luck!