World'tober... building a world in 31 days

It's October! That means Nano is just a month away!

And, ack, I need a world.

I thought I'd try to go through my worldbuilding process, such as it is, and break it down into thirty easy posts.

Today, I'm cheating. This is the easy stuff.

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First

Pick, loosely, a setting genre:

Realism?
Urban Fantasy/Magical Modern? (not quite the same thing but hey, broad strokes)
Post Apocalyptic?
High Fantasy/secondary world? (Thanks to lemon_badgeress for a reminder of the term)
Cyberpunk?
Sci-Fi/Space Opera?

In my case, after a couple polls and some discussion, I'm writing a post-apocalyptic urban fantasy.

That means magic, technology, grit, and ruins.

Of course... lots of my settings are one or both of those: Cali, Addergoole/Fae Apoc, the Planners, Unnamed Water Apocalypses 1 & 2, What-If/Ninefold... So, obviously, this is only the very broadest stroke.

But it's an important stroke.

What about you? What genre is your setting?
Can you think of any clear options in setting I missed up there?