So the big Island will require a 2nd test, a rapid Antigen test, upon arrival. Assuming you have your NAAT/PCR test 2-3 days before departure, they are saying that they want two tests a couple days apart to make false negatives far less likely, as it will.
I think it is unnecessary IF they are going to continue to require appropriate use of a face mask, social distancing, and other ordinary precautions (bars closed, no big gatherings, esp indoors), and engage in contact tracing. The basic pre-departure NAAT test will catch and remove most asymptomatic carriers. Not all. Some will be infected but not yet show positive. But, the risk of those individuals leading to community spread is addressed by the precautions required and expected after arrival. Spread occurs from failure to use a mask, failure to respect social distancing, etc. Spikes occur from failure to contact trace. Masks and social distancing are necessary because we don't know if someone is contagious. If we do know, then they are not necessary.
So, if they are going to go to the 2nd test requirement, then those that have passed two tests 3 or so days apart should not be required to wear a mask if they choose not to and should be allowed to dine indoors and gather in groups, again, if they choose to.
It is IMO overkill to require two tests AND the full range of precautions. You should not be subject to citations, fines, arrest for not wearing a mask or not socially distancing if you have proven you are not infected via multiple tests days apart.