Joey heres an interesting look back at the same issue with other states
and a link to NY. organization in the rockaways that utilizes the Public Trust doctrine to establish and keep access.The law in New York state is 10 feet past the high water mark. Each state has its own laws regarding who owns the beach. In most coastal states, the public owns the land seaward of the high tide line http://www.apublicrock.com/
This link is provided for your perusal in the hopes that it will proivide the proper info to irritate the living pis out of the rat worshiper. Public access law library
Ps: Check with your chamber of commerce before you walk the tidal line to the jetty just in case someone calls the cops. That organization also has a list of attorneys willing to provide legal assistance for right-of-way preservation free of charge.
Good luck. Tell him he should have filed a police report for his dinghy and educate him on the law.
an excerp If you own beach front property and really believe you own all rights to sand and water in front of your property, you were wronged