The GAP is also being discussed over at the Touring Forum these days. I draw you attention to post
#47 in the series, which starts
DO NOT DO NOT stop at Ohiopyle! The campsite is pretty much straight up a steep rocky path that is basically unrideable. Instead stop at theKOA in Connellsville or ride on to Confluence. There is also a free site in Confluence. No showers but the river is not far off and there is a food store nearby.
The whole thread is at
http://www.bikeforums.net/touring/10...questions.html