Mike,
You will want to contact UMS (United Mobile Sport Fishermen). This is a National Organization that is made up mostly of beach buggy clubs and has the largest collection of knowledge regarding access and the laws that pertain. If I am correct, I beleive there is a UMS board member that brought up the exact location you mention in one of his reports. There are a couple of influential Ny Organizations as members.
I suggest you go to the web site and e-mail the board. Someone will get back to you. You can do this through the web site
www.umsnet.com If you do not get anywhere in a week, PM me and I can get you a phone number directly.
Yes, I am a board member