I have a Heavy class Galleon ship that I purchased from the Scrimshaw's ship vendor. That ship is so huge, and looks so magnificent.
Now, I am thinking, we pirates all run around on the deck. Being able to anchor anywhere we wish, I really would like to see an interior room (size determined by size of ship) that we could decorate with furniture. We have the island, which is fine, but we should have a single room in our ship that we could decorate. We could go in our rooms when we anchor, see the surroundings through our llittle windows, and just camp out in the open sky. No need for shared bank or what not, just maybe a single 'storage' option for furniture and what not. Like an "attic" that you can decorate. Only it is in your ship. :P
I still think that is such a good idea, that would really put those large ships to even more use than ever.
What I would rather and would like to see is that the ship's interior contains all your crew members making it not needed to visit tavern basements anymore. I don't see why my crew needs to meet at such places when they should be in the belly of my ship instead.