Out and back on the Desert Classic trail in South Mountain Park in Phoenix, AZ. My wife's cousin took me out for a ride.
No big ups or downs on this ride. Lots of arroyos, a usually dry creek bed. Each one is a quick down, and then back up again. They range it height from 5 to 20 feet.
The big challenge was the rocks. On the trails I've been on in MN they purposely bury rocks in the middle of the trail to make it interesting. On this trail, there are rocks of every size throughout. I like my bike, but it is pretty much shockless and suspensionless. I couldn't keep up just because I couldn't go at a moderate pace on the rocks -- I'll be looking for a new bike later this year. There was plenty of smooth gravel too, and that was lots of fun.
On our way out it was nearly dark. We saw quite a few riders heading out with headlights on. Seemed a little crazy given all the cacti and rocks around, but I suppose they are used to it.
Lots of other trails to explore in the future.
Forgot my Garmin, so no tracks, but here is a map showing the park trails:
http://phoenix.gov/parks/hiksogud.html