Minecraft spaceship ideas?

Hey i'm building a huge starship over my map and I need ideas for inside, best answer goes to the person with the most and best answers no detail is to small. I have already thought up the bridge, portal room, brig(Jail) library, sleeping quarters, showers, weapons and armor room, life support room, observation decks, kitchen, captains quarters, engineering room, need more ideas please

You can make a movie theater, boxing arena, stadiums of all sorts, main garden, canal system that runs through ship, resturants, art gallery, lab, mechanical plant, etc. (I hope your build is a great success!)