Check out the North& South County bikeways in Westchester. Take the #6 train to Pelham Parkway and ride the paths out to Orchard Beach/City Island. From Pelham Pkway you can also take the Bronx Park paths to Van Cortland Park via Moshulu Pkway or ride along the paths of the Bx River Parkway to e 233rd St and then connect to the Bronx River trail to the Kensico Dam. Look at Traillinks.com for routes in NY.