I'd quite like one set in a theme park. That is, set in the *entirety* of a theme park; not just the tourist areas, but also the behind-the-scenes workings.



Walt Disney World (or something based on it) could be excellent for that sort of thing: Not only do you have multiple theme parks, you have the hotels, a large sports area, forested regions, shopping areas.



Just as I was thinking that, another thought hit me: A Fallout could be fantastic in such a region. The Cult Of The Three Circles around the Magic Kingdom? Deathclaws lurking in the forests of Fort Wilderness? Ragtag bunches of survivors in Pleasure Island? Insane scientists who believe that Blizzard Beach is a naturally-occurring phenomenon and strive to mimic it?