Nobody asked but …
Prison islands and kidnapper retreat islands excepted, going to an island is supremely voluntaristic. My wife and I are celebrating Mother’s Day/our 49th Anniversary on Block Island, Rhode Island. Although the range of freedoms we may take are bounded by the sea (until our return ferry sails Saturday) we can do anything else that classifies as voluntary agreements between us and all of the other people here. I suppose there may be a police department, but I have seen no signs. I have only seen a local government. There are two lighthouses, once under the auspices of the USCG, but those are owned by non-profits now. There are a couple of fog horns still on duty. But this land is far more ruled by tides than by statist humans.