So, I’ve played several games which had some pretty epic fights that took place in a nightclub or similar establishment. Such a structure might be worthy of inclusion in CDDA.
I was thinking they might spawn in cities on occasion, and have a backup generator you could repair; you might use it for a number of purposes once power grids get implemented, but initially I was thinking it would allow you turn on the sound system. Holographic dancers or something might also be a possibility. Turn on the sound system, crank up the volume, and let the zombies come to you for slaughter. Holographic dancers or similar might act as distractions to keep some enemies off you.
You could stay and fight the horde the noise brings, set up a killbox to slaughter the zombies as they enter, or simply turn the music on and set the timer on a mininuke or something and run.
Might also have another version which is already filled with enemies that are either hiding or “asleep”, and when you turn the power on, say, to open an electronic door or something, the music kicks on and all the critters inside wake up, as well as drawing the attention of whatever might be outside.