Hows it going Buchsenr, besides KauaiKahuna, I know of Mummasan as well as myself that live on Oahu. Homebrew in Paradise is the only brew shop on Oahu, luckily the owner (Mike) is great and his prices are good.
For fermenting, I recommend you get a cooler. Up until now, I have been using a MaxIgloo 70 quart from Costco. I just leave the lid open and fill water about 1/3 of the Carboy and add ice as needed. I just picked up a Sanyo that I will use to ferment in though. I know Mummasan uses a son of a fermentation chiller. Good luck!