Seriously, they're everywhere!
Instead of trees, Tucson has cacti. I know, duh it's a desert. But as a first-time Southwestern US desert visitor, I'm pretty impressed. The stuff and brush I'm used to; both Eastern Oregon and parts of California are lousy with the stuff. But it's the gigantic, pole-like cacti that are just totally blowing me away.
I feel like I should be seeing a chuck wagon or Yosemite Sam or John Wayne or something. All of a sudden, I want to go to a rodeo.