This is a rail trail that is about 17 miles long but also connects to the Conewago Recreation trail for an additional 5 miles. Just off this rail trail is Governor Dick Park with some great single track and fire roads as well as Mount Gretna that has some side trails along the way. The Horseshoe Trail is also nearby providing legal access through State Game Lands.
Just north of rt. 283 on rt. 743 or on the north end at Union Canal Tunnel Hill Park
http://www.singletracks.com/item.php?c=1&i=9198