We got back from Vegas on the weekend. We rode Blue Diamond. First day we just did the 9-mile loop. It ook 2.5 hours, but that was with an 8-year-old in tow. The nice guy at the bike shop said a couple 9-year-olds had made it around, but he had not known of someone as young as 8 making it the whole way. If I hadn't gotten us lost a couple of times, it would have taken just two hours. They could use a few signs as it is easy to get lost out there. Other than that, the trails were fun. Lots of options, lots of climbing, which also means lots of downhills.
The second time out, (this time without the 8-year-old) we covered a lot more ground. We hit Mustang Trail and Late Night. Both are fun, flowy trails. I'm glad I didn't fall into one of those big cactus. Saw some wild burros and a weird looking lizard.
Bootleg Canyon looked like a lot of fun. We didn't ride it because the bike shop over there didn't have a bike that would fit an 8-year-old.
As an aside, we saw a lot of roadies riding the hills in the Blue Diamond area.
Thanks again for the advice.