Terry,
I've given some thought to how one would carry here. Its not easy. I typically wear a light long sleeve shirt or jacket over a sleeveless T. Both untucked. It wouldn't be too hard to conceal something made for CCW but a full frame anything would be more difficult. People wear more in Hawaii than you might think, as well. Its not unusual to see folks in jeans and button down shirts or t-shirts. Ankle holsters, body band holsters, etc would be easy enough to get away with.
Adding something pressed to your body would up the heat quite a bit, though. I'd prolly carry in a shoulder bag. Not as quick for access but simpler for the climate and comfort. More likely to actually have it instead of thinking "too damned hot today..." I'd modify my existing bag for the holster, as well, instead of buying a "look at me! I have a concealed carry product!" commercially made piece. I know most people wont notice but the police will. While the BI is, by and large, more gun friendly the law is still the same and I see no reason to give the police an excuse to go poking about in my business.
I do think the chances of CCW being allowed here are slim, though. The policy and culture of the State is "Silly Citizen! Guns are for cops!"