East of Ronkonkoma near Yaphank, the Long Island Motocross (aka Island Motocross of NY) has a motocross track and a PeeWee track open to ATV riding.
To reach Island Motocross of NY from NYC, follow the Long Island Expressway to Exit #65. Head east on Horseblock Road. Just past the Sunoco gas station, look for the entrance on the left at the light.
Overall, Long Island Motocross is the 16th most popular ATV riding trail of all 26 ATV trails in New York.