This is the north extension of the Wallkill Valley Rail Trail extension which runs over the old railway trestle in Rosendale, NY. Here is a link to some information about the trail:
We'll pick it up from the parking area at the Binnewater Kiln Parking area which is north of the railway trestle. (Click on the "Wallkill Valley Rail Trail, Rosendale" link above for the location of the parking area on google maps). From there, we'll head back to the trestle and then we can decide whether we want to head south or back north.