Yo ho, me hearties, yo ho! There are hundreds of FPS games available. Not many of them give you the chance to be a proper pirate, though. With Blackwake key in hand, you will be able to board or sink enemy ships and rip through their crew with your teammates.
You're not invulnerable though, and nothing is more devastating than a cannonball to the face. From that, even a bottle of rum won't be enough to heal you.