what about the countryside of NY? I don't think you'll find many fields actually IN the city, unless they're indoor fields. I live in the San Francisco area and other than a few fields in some urban areas on the south side of the bay, most of the fields here are at least an hour out from where I live. Almost all of them are in the hills or farmland areas, fairly rural compared to most of the bay area.
I hate having to roadtrip to a field, but if you find one a little further away that is what you were looking for from a paintball field, it should be worth it.