A couple of recent bicycle journals for you to consider:

Ted Herman's "Pittsburg to Philadelphia, Pennsylvania July 2007"
He rides the Great Allegheny Passage to the C&O Canal, exiting at Williamsport, MD and continuing up through Gettysburg
http://www.crazyguyonabike.com/doc/?...c_id=2765&v=4r

Jim and Kathy Winner's "Hearts Across Pennsylvania" took them to Lancaster by way of Bike Route "S"
http://www.crazyguyonabike.com/doc/?...c_id=2573&v=Bs

And one more for good measure:

Chris Bailey's "Pennsylvania S bike trail", which took place in 2005
http://www.crazyguyonabike.com/doc/?...c_id=1154&v=2p

All of these journals have a guestbook -- a means by which to contact the authors. I have ridden the Passage and C&O many, many times and live in Ligonier, PA -- just off of Route 30 -- kinda between Ohiopyle and Johnstown. If you'd like a tour of the Johnstown area - Flood Museum, Inclined Plane, Johnstown Flood National Memorial (South Fork Dam site), drop me a pm and we'll make arrangements.

Judy