In Nassau County on Long Island, the Stillwell Woods route is a popular 4 mile loop, and is probably the most challenging Long Island has to offer. The route connects with the Nassau-Suffolk Greenbelt Trail leading to Bethpage State Park.
To reach the mountain biking trailhead from the Long Island Expressway (US495), exit at Route 135 North and continue to Exit 14 East (second to last exit). Proceed to the third traffic light, which is Southwoods Road. (Along the way, youll pass the Syosset-Woodbury Community Park, which houses my bicycle recycling program). Make a left onto Southwoods Road, pass two traffic lights, pass the Syosset High School on your left, and look for signs for Stillwell Field on your right. Turn into the parking lot and drive past the athletic fields to the far corner of the complex, where you ll usually find several other bikers gearing up for the mountain bike ride.
Overall, Stillwell Woods Perserve is the 27th most popular mountain bike trail of all 48 mountain biking rides in New York.