It's basically a forest with pretty large areas taped off as the playfields. One of the areas by the safezone (basically a stockade in the middle of the site, where it is all organised and you are safe from the guns), which is the only 'open' area on the site, has stuff like wooden bunkers with camo netting on them, a burnt out jeep and a fortified wooden tower on it. It's pretty awesome man. It's like predator.
Oh yeah, they actually have a predator costume somewhere on the site that they use sometimes. And a bazooka.

For some reason this picture I totally didn't photoshop makes me want to play quake.