I spent an entire day with the family riding the Great Allegheny Passage between Confluence and OhioPyle and it was a great, enjoyable ride. It's mostly in the shade along the Youghiogheny River. The path is very flat on dirt, which you can ride on with a hybrid or mountain bike, but probably not a road bike. There are a few bridges which take you across the river at certain points. It's highly recommended.