I just realized my first comment only applies to the "main" Hawaiian Islands. In the Northwest Hawaiian Islands, there are lots of different access regulations

I just realized my first comment only applies to the "main" Hawaiian Islands. In the Northwest Hawaiian Islands, there are lots of different access regulations, and none of them open to the public. On some islands, the scientists with research permits must carry and dress in sterile clothes separate for each island--so as not to spread seeds, insects, and possible pathogens between islands.