I would like to
 

sail on someone else's ship with them and fire some cannons, fight some sailors/skeletons.

Is there anyone with a ship that has broadsides that would let me join them for a few rounds? I've only sailed alone to this point and was wondering what it was like to be part of a crew.

You can sail on my ship, it's about the only thing that I can do in the game right now. My pirate is Elizabeth Starhawk and my ship is the Scarlet Voyager.