30 miles for the New Paltz South - Rail Trail (Wallkill - Horse Farm variation), which goes to some of the same places, but on quieter roads, including 9 miles on an unpaved off-road trail. But it misses out on some nice farms and views, and some fun road sections.
See a comparison with other routes in the area.
Traffic: Some high-speed traffic sections, but many quiet roads. Some of the other roads which are not really quiet are not that wide and or do not have shoulders (like some sections of Ulster County Route 7) -- see Traffic Discussion for more detail. If you are not experienced and comfortable with handling that sort of traffic situation, you should consider choosing a different route.
A route that visits some of the same places, but mostly has much less traffic interaction, is New Paltz South - Rail Trail and Roads (Wallkill - Horse Farm variation).
more . . .
by car from South or North: NY Thruway to exit 18 (Poughkeepsie / New Paltz). From the exit, turn Left onto Rt 299 West, which is Main St of the village of New Paltz.
by car from the East: Rt 44 West across the Mid-Hudson Bridge, then Rt 9W North a couple of miles, and take Rt 299 West to New Paltz.
The start of the route is just after Main St (Rt 299) crosses Rt 32 (Chestnut St) at a traffic light -- between the Wallkill River bridge and Rt 32.
GPS latitude-longitude = N41.7466,W74.0900 = 41.7466,-74.0900 [on Google Maps]
Parking: There are lots of options in New Paltz. What usually works for us is to park about three or four blocks from the Wallkill River bridge, somewhere north of Main St. Then ride west on Front St / Lenape Lane and/or south on Huguenot St to reach the starting point.
by train: New Paltz is 11 to 12 miles from the Poughkeepsie train station, with service by Metro North from New York City, and by Amtrak. For ideas about riding a bicycle from there, see Connecting between Poughkeepsie trains and New Paltz.
Other starting points: Wallkill.