How can I go from JKF airport New-York to Shelter Island by train ?
According to Google Maps, you’d hop aboard an AirTrain JFK train (which stops outside each terminal) bound for Jamaica Station. Then transfer to an MTA train bound for Ronkonkoma. When you arrive in Ronkonkoma, transfer to a train bound for Greenport. The line’s terminus in Greenport is adjacent to the Shelter Island ferry terminal, which you will need to take to reach the island.