The Wikipedia page for Hart Island says that
The only access to Hart Island is by ferryboat. Hart Island and the pier on Fordham Street on City Island are restricted areas under the jurisdiction of the New York City Department of Correction. Family members who wish to visit the island must request a visit ahead of time with the Department of Correction. New York City's government offers no provisions for individuals who want to visit Hart Island without contacting the prison system.
I'm not sure what the phrase "offers no provision" means in this context. Offers no assistance? Offers no protection? Will arrest? Oxford defines "provision" as
financial or other arrangements for future eventualities or requirements
So does that mean assistance? Meaning, if I try to get to the island myself without contacting the prison system, I technically can but the DOC will not help me? Or is there another definition that would result in my arrest?