OK, here is the scoop for Maui, which I found by going in person to Walgreens [Lahaina] where a very nice woman gave me the actual information and the card attached below. (Despite what the resorts say, neither Longs or WG do this kind of testing].
Attached is the information for the Doctors On Call from WG. I called them and the woman could not have been nicer. The location nearest to WKORV and MOC is just up the road on Lower Honoapiilani Rd in the Times shopping center (and there is another site by OGG) . They are open M-F 8 am - 3 pm (last tests 2:30 pm).
Appointments are neither required or given. Just call them when you are in the parking lot and a nurse will come and take the tests. The cost is $95 to them and ~$125 for the lab that does the testing and they will take insurance information and try to bill insurance. They are set up to deliver and upload the results to Safe Travels Hawaii within the 72 hour window. Will be going next Wednesday 2/10/2021) so will report on how it goes.
And as an aside, the Times grocery store is a wonderful store, better than Safeway imho, there is a fish shop just up the road from there, a very good ABC store, and light traffic and plenty of parking everywhere.