Just read a article about people who were refused entry into HI because they didn't get tested at an "approved" site; they were tested at the Mayo Clinic.
Have also read conflicting reports about varying rules on different islands and what you had to do to get and stay in. The last article was about travel to Maui or Kauai where you could take a test on arrive but have to stay at one of the resorts, wear a bracelet/tracker to monitor your movements and then you get to take it off after you clear w/in 3 days and get a phone app "passport" to let you roam the island.
These are just some of the confusing reports that I've read. On the other hand, if you research the rules and follow them exactly, you should have no problem getting in but, then again, all businesses are not open and the cost of car rentals have skyrocketed w/reports of ppl renting U-haul trucks instead because they're cheaper. LOL!
Bottom line, it's just not worth it (to me) to even bother trying to go there.
Same applies to A LOT of other places in our country Not to mention that most of the other places in the world still have a worse C19 problem than we do here in the US. Heck, you still can't drive into Canada (not sure about Mexico) for personal reasons.
So, I'm just staying close to home and I'm not going anywhere, unless I can drive "there" in my own car.