When I first started this, it was supposed to be a maze for fat kid, but I opted for something a little more direct. First the map wasn't confusing enough for a maze. I just kept it as a windy road, with a bunch of surprises and jackpots.
First, it is an infection map that transcends all three levels of the map: The Skybox, The Sandbox, and The Crypt. It also includes some lighting effects, a lot of weapons, some vehicles in one area, multiple paths to get places, dead ends, and even a couple of death traps (and one very difficult to defend[on purpose] fortress). I think it turned out pretty good.
Here's the links: One For My Map, and then the Game Type
Map:
http://www.bungie.net/Online/Halo3UserContentDetails.aspx?h3fileid=74769246&fset=62763
Game Type:
http://www.bungie.net/Online/Halo3UserContentDetails.aspx?h3fileid=74769246&fset=62763
Now, here's the pics from the map.

Where the humans spawn.

It's one of the blue paths.

The ordinance room.

It's electric!!!

The middle hallway.

Safe haven is through there.

Overhead view 1. The bend in the path.

Another overhead. The tee-pee tunnel is the human spawn zone.

Near where the zombies spawn.

This guy took the red path...

But so did he!

But, not him...

??? Why is that there? Odd...

Ahhh...Dammit

Crypt view 1. Many weapons.

And turrets too! Sweet!

Some vehicles too. check the dark corners.

The only section on the sandbox.

Right below the bend area.

THE DESTROYER OF WORLDS! (I kept this on my file share. I like this pic)

Overall I think my map is decent at least, especially for someone who doesn't normally use forge, lacking the attention span for such a thing :)

I hope you like it!