Places to Airsoft in Stony Brook/Setauket, NY?

Hey, I'm looking for big places to play airsoft in Setuaket/Stony Brook, NY. I want somewhere that people never (if not rarely) walk through, can not be seen from the street or from houses, and somewhere the cops won't give us any trouble. It would also be nice if the place had some interesting terrain to play on, not just a plain woods. Maybe even a place where it would be ok for me and my friends to build a few bunkers? Nothing advanced, maybe just a small hole and some stacked sandbags or something like that. Thanks for your answers!