We arrive from Dallas at LGA at 10:36 AM. We have to go to JFK as we leave there at 5:40 PM. We need to know the best way to get from one airport to another. Also, we would like to store our luggage at JFK and see some NYC sites. Is this possible within the time limits we have? If it is, what would be the best way to see some sights. We have never been to NYC before so we have no idea what might be near JFK.