Listen, whatever you do, do not be talked into a 'taxi' from within the terminal. After a long flight I allowed this. We were driven by an unlicensed carrier from a car park at the airport to our hotel. No hassles, straight there.
We were charged $110!!!
We were expecting $55
There is a 'Yellow Cab' line outside the terminal. Use this it is a fixed price and safe. We could have been taken anywhere by a stranger. Looking back it was dangerous and foolish. If you get approached call security. Some of these guys are not registered or insured.
Getting to Manhattan