I've hiked some of those trails in Phoenix. South Mountain Park is really nice, and they had info panels about the more common desert plants, which I really liked.
No, didn't know about the diet. Congrats on the first 9 pounds! I need to lose about 20, I've been a wicked slug this summer, with the humidity. Tomorrow is supposed to be cool and dry, so my plan is to get up early and take a nice, easy run with Beau and get back on the Couch to 5K plan again. That's what I say now. We'll see what happens when the alarm goes off at 5:30 tomorrow morning.