Let me suggest one of the parking lots at Westchester Community College. Wide open spaces, almost nobody is there on the weekends, and its far less likely to attract negative attention than anywhere in Queens. WCC is a few minutes from the Bronx River Parkway, the Saw Mill Parkway, the Sprain Brook Parkway (which is called the Taconic a bit further north), route 287 (thats the Cross Westchester Expressway, different from 287 in Jersey). Its just about the mid-point between north Jersey, the five boroughs, southern CT, and upstate NY.