If you are prone to being seasick, get a prescription from you doctor for transderm-V. It's a seasickness patch that is really effective, but you have to take it at least 8 hours BEFORE you go out fishing for it to be effective. It's just a patch that you put behind you ear. There are some side effects, such as having blurred vision when looking far out. What I did when I took it, was to cut the patch in half. I experienced ZERO side-effects, and never got sick. But if you are prone to getting seasick, it may be better to take a whole patch.
When fishing Hawaii, it's good to check the seasons for when the fishing is hot. I went in February, which supposedly is a horrible fishing time. Didn't catch a thing, but I guess that's why the call the sport fishing and not catching!