Aqua. I would use cool, aquatic color scheme of blues and greens. There would be aquariums everywhere, including the cool column aquariums. The ceiling would be an aquarium. People would be surrounded by fish. The atmosphere would be low key, but not dark, or closed in.
There would be a dance floor, but the music would be live, a pianoman most of the time.
I would have a kitchen, with a simple sandwich, salad, appetizer menu.
If he would agree, I would have @talljasperman be my security, because with a guy that big in view, few would try to make trouble.
I would call it The Tenth Atmosphere.