I spent a few hours on this last night, had issues to start with as i could not use my weapons once i step on the ship, had to move the game from external to internal and it worked fine then.
My self and my crew did a few chest quests and skeleton quests, plus a quest for chickens, we also found some sunken treasure which gave pretty good coin, but to top off the fun we were a man down as he crashed and couldn't re join and the Kraken appeared, it can happen any where, the sea will turn dark and the ship stops, then you fight it's tentacles, We won which was awesome, and carried on with the quest we had active.