Yup, there's gated communities in New York, but they're not THAT gated anymore. Seagate is pretty much straight out of the suburbs on the Western tip of Coney Island - it's even got a abandoned lighthouse. I'm always curious as to the legalities of how private neighborhood ownership came about. I'm sure in the 70s and 80s there was a little more segregation from the rest of Coney, but now days it's not too difficult to visit. Wonderful views of the Verrazano can be had as well. The area nowadays is way more orthodox Jewish than I would have guessed.
More can be found here
Neighborhood: Seagate. Tracts walked: B336