With all due respect to everyones opinion, I would chime in and also concur with those who say: With only a 3.5 hour layover @ JFK and and International Connection at that, in my opinion it would be ill advised to leave the airport. To put it a bid more to the point, " What were you thinking? Are you nuts? If you had 5 or 6 hours perhaps your notion to leave the aiport might be more practical. Frankly, to want to do something in 3.5 hours is almost laughable. With all due respect.