With this as your back drop, it is hard to really go wrong...hiking or biking.
Add in some singletrack and you have some pretty incredible trails within 30 minutes of the Las Vegas Strip.
I had a cousin's wedding this past weekend in Las Vegas (some family lives there, not a "Vegas Wedding"), the weather cooperated 1 of the 2 days we were hoping to ride. Kendall forgot some necessary bike equipment, thus she settled for some hiking and taking pictures (nearly all pictures were taken by her).
While playing with my nephew at the wedding, I realized how big that pain in the rib really was (from crash on the mountain bike a few days ago while on 50 Year). After talking to a few nurses and friends, I think we all concluded that I have a bruised rib. It hurts to sneeze, cough, or sit-up.
Biking is not too bad, just have to stand up during the technical stuff.
Plenty of technical sections on the Hurl and Black Velvet loops.
More info/map on Blue Diamond/Cottownwood here.