Kauai requires a negative Covid test to pass a phalanx of National Guardsmen when you enter, plus a 3 day stay in a bubble resort at the end of which you must test negative again to leave quarantine. During my recent stay at one bubble resort the rules were quite lax and it was easy to mingle with people who were not under quarantine. Contra the parent, it is definitely not the case that people are wearing masks on the beach (nor should they), although they are generally still required in all other indoor situations except restaurants. I think you are right that outdoor settings and ample sunlight are important factors in Hawaii.

Conditions are still dire for the tourist industry even after things have opened back up a little bit. Just today I saw a headline in a local Kauai paper about small business owners organizing a meeting to agitate for loosening some more restrictions to help keep them afloat.