I echo others who have mentioned that the PATH train should be just fine; you can't beat the $2.75 price tag; 11pm is not late by NYC standards, there still will be plenty of foot traffic near the Newport station. For an added level of comfort, though, I want to mention that the conductor, who opens/closes the doors at each station, is in the frontmost car of the PATH train. If you're nervous, you could ride that car.