Aloha! As far as keeping fish after our trip, we do rely on our guests being able to keep/prepare their fish in their condo/etc. For those staying in hotels, we do not have a pre-arranged deal with any restaurants. Many have found success asking chefs at their hotel restaurants. You can always ask the chefs at those restaurants ahead of time. As far as other restaurants go, our guides have had mixed experiences asking them to prepare fish. You can always ask your guide for his advice on the matter depending on if you catch fish and what it is. Its worth noting if you have never spearfished in Hawaii before, you will definitely want to focus on the instructional part of the lesson, as opposed to expecting lots of fish. As you will find the sport to be much harder (and therefore more fun) than you expect:)