I've tended bar in quite a few. Bummed drinks in quite a few more. And in telling dive stories - always the truth, and nothing but the truth. He dragged his buddies to the publick house nearest to the dock, and they took turns inventing more and more impressive stories while unwinding from the tensions of the day. It's a short walk from where your dive boat docks.
Drinks are cheap.
All sorts of sea artifacts are hanging on the wall, and some sea artifacts are sitting on the stools. The bartender is a character. He has a tattoo that he shows you and one that he doesn't. He remembers the names of everyone who's ever been to a wreck, and what they brought back. He knows more about the conditions out there than any boat captain or dive store owner.