If you're going to be on Oahu, the Honolulu Aquarium Society, which has been around for a while, meets on the first Friday of each month at 6:00 p.m. at the Kuhio Elementary School cafetorium. Although I'm not a very active member, I try to go to meetings when I can -- they usually have a monthly presentation and an auction. There's also a monthly newsletter, but it's kind of sparse.
If you're a saltwater aquarist, joining the Friends of the Waikiki Aquarium (I think it's $40/year) entitles you to fill up your buckets from their filtered sea water tap.
Regarding imports, if you check the Hawaii Dept. of Agriculture (start at www.hawaii.gov
), you can find a pdf list of allowed fish/plant imports. A lot of people complain about the restrictions, but Hawaii being isolated islands, can't be compared with the (lack of) import restrictions for mainland states. Otherwise, alien species tend to pummel the native fauna if they take hold here. I try to maintain some minimum environmental sensitivity
Finally, there are a number of pet stores of varying quality and size, but my personal favorite is Pets Plus on Ward Avenue, where the staff is friendly as well as knowledgeable.
Eheim Pimp #70!
20G long: dwarf cichlids, sparkling gouramis, and a couple of kuhli loaches. 2 x 24W T5, DIY CO2, Eheim 2213.
75G: Cichlids, rainbows, gouramis, loaches, and tetras. 4 x 54W T5s + 2 x 55W PCs, pressurized CO2, Eheim 2213 & 2215