Edit: jacobk asked where this little canyon is, so here's a screenshot of a Google map. The entrance to the canyon open space is at Russ Boulevard and 24th Street (blue marker in map below). It's not much, just an opening in a fence and a garbage can; cross the open area, and you'll see the trail down a little to the left of where my bike is parked in the photo above. Use caution, however, as it appears that some unsavory characters frequent the canyon area occasionally. Also, the canyon is quite small, but it sure is pretty. There is also a staircase up (or down--that's usually how stairs work) where the red marker is on the map.