In my post-apoc games, I'm big on using a bombed-out, future-ified version of the players' Real World city of residence. The group seem to get a HUUUUUGE kick out of it, as it makes the setting so much "closer to home"...and provides a meta incentive to explore the sandbox. You know, "I wanna see if my old high school's still standing!" kinda stuff.
Accordingly, local shopping malls make perfect dungeons / fortresses / lairs...and their maps and store directories are just a Google away.
Here's a few maps of authentic consumer meccas in the modern Houston area. Just print 'em, change stores to taste, mutant-ify and high-tech 'em up...and viola! Adventure!
|The Woodlands Mall|
A blown-out and greatly expanded Greenspoint Mall is the main campaign city, and The Willowbrook map above was the site of last weekend's crawl through the ruins. Stay tuned for the recap!