Don't know what to offer for being on a boat other than to bring paddles. However, you can get in just as much trouble getting lost hiking through a spot to a new fishing hole. Doesn't matter where I'm going, or what I'm doing, I've got a few essentials packed that can take up a lot less room than you might think. Make a list and start carrying one for each category, and a backup/alternate as you see fit. Consider the 10 C's plus some...
Confidence and conditioning top the list. Know what to do, how to do it, and be prepared physically to accomplish it. Then pack up something to cover consumption, cutting, combustion, cover, container, cordage, candle, cotton, compass, cargo tape, canvas needle, communication, and care (first aid). Include small bills and coins in case you do get somewhere, as well as spare keys. Add a small work kit or multi tool and bring a hard copy of important contacts.
Those are my priority items for work, travel, play and I add to it depending on the activity.