Visited the Best Kite Center in New York a couple of years ago and it is absolutely the sickest place to ride. Based in Amityville NYC, Long Bay.
www.nykitecenter.com/This is a real professional organisation. They taxi you out on Jetski to these little grassy islands, surrounded by flat water in Long Bay. Pretty cold in Summer also so take a wetty for sure.
Further to the North we also Kited in the Hamptons where we got some great little surf and kite past some crazy big houses.
Get in with the Kiters at the centre and they will help advise you further, even you have no gear, you can hire what you need for the day.
Joe