Few years ago now, but I contacted Mcghies bike shop and did a couple of days road bike hire from them, and a MTB tour on some of the single track near Red Rock Canyon.
There’s some great road riding west of the strip from the door of the shop, you can do a couple of long loops on fairly quiet wide roads, the Red Rock Canyon loop is also worth doing, from memory its about 17 miles.
The singletrack was also pretty good, nice and flowy with a fair bit of descent, we chose to ride from the shop so theres was a fair amount of climbing, but they would also drive out to the top of the trail.
Riding in the suburbs is ok, but I chickened out of going anywhere near the strip.
https://mcghies.com/