Can some of the floors be themed? A jungle floor for instance would be pretty cool. Dim lights, loads of artificial ferns/plants etc. Like something from an overgrown city a la I am Legend, The Last of Us etc
John Wick club type neon floor. Loads of pink and blue fluorescent lighting, music etc
Hospital themed floor.
Creepy floor with loads of occult markings, fake blood on the walls, bloody drag stains on the floor, alters, rituals etc. Like something out of Doom.
Supermarket floor.
Prison floor.
Containment floor. Think Labs level from Escape from Tarkov. Decontamination tents, PVC linking tunnels, temporary lab type setups etc
And yes, I'll take free membership as payment for my helpful suggestions 😄