I've been there twice and studied their history and how they live now. I checked a grocery store and prices are really high because it all comes by ship. If you live in Hawaii and buy something from this country, your shipping charge raises the cost of that item so high you will think twice before you order it.
If no ships come, Hawaii dies. Planes can't get enough of anything there, it must be ships. Ships allow the many people who live there now, to live. Before ships, not many people lived on those islands.
I would not want to be in Hawaii surrounded by undrinkable water and no food or anything else coming in.
You know Hawaii is part of the USA, right?
Fuel for power comes in by ships.
But fuel and power are not needed for heating there. And days are long.
I would not want to be in Hawaii surrounded by undrinkable water and no food or anything else coming in.
I certainly wouldn't want to be on Oahu because of the population density in Honolulu. But the other islands would be fine, relatively speaking, lots of rain to be captured for drinking, wonderful growing conditions for many foods and excellent volcanic soil (in most non-rocky places). Drinking water can also be produced by distillation. Obviously a fraction of the population would die before self-sufficiency got underway but that would be the same in all states in this scenario. The isolation of which you speak negatively would also serve to keep out diseases and roving gangs from the mainland. This would be a factor even from island to island.