The quarantine issue is a real problem for places that have the ability to isolate but also depend on outsiders for economic activity. What does 14-day quarantine mean in HI?
I have seen similar restrictions at county lines at some places in the states. But does that mean the person has to hole up in some residence and can't even go to the store or a walk outside off their residence? For example, I know someone that wants to go to their rental property (condo) in the mountains of North Carolina. They own the property but they can't go there because the county has a strict 14-day quarantine for anyone coming in to stay overnight in the county. It's a significant fine and the word is being spread that it is vigorously enforced.
Legality aside, that sends a strong message to stay out - no one is going to travel into a place where they then can't do anything (including groceries) for two weeks.