High Quality Content by WIKIPEDIA articles! The Wallkill Valley Rail Trail is a 23.7-mile (38.1 km) rail trail and linear park that runs along the former Wallkill Valley Railroad rail corridor in Ulster County, New York. As of 2011, it stretches from Gardiner through New Paltz, crossing the Wallkill River as it reaches Rosendale. The trail is separated from the Walden–Wallkill Rail Trail by two state prisons in Shawangunk, though there have been plans to bypass these facilities, and to connect the Wallkill Valley Rail Trail with other regional rail trails.