Nassau-suffolk Greenbelt Trail features 10 miles of hiking trails near Syosset, NY.
Take Long Island Expressway to Route 135 (Seaford Oyster Bay Expressway) North to Route 25 East. Go a mile or two look for Pathmark on your left. The parking lot is next to a Stop & Shop on Route 25 (Jericho Turnpike). There is a hot dog guy in the lot that sells some limited bike stuff. Sign in lot says Trail View Park.
http://www.tripleblaze.com/trail.php?c=3&i=424