If you get a chance to get out of Las Vegas and you need a chance to breath some fresh non-smoking air, head out to Red Rock Canyon. It is a beautiful park with a 13 mile drive throughout the Mojave Desert. We were able to see wild mountain goats, burros, and jackrabbits. Very cool.
Tickets to get in are under 10 bucks and you can stay as long as you like. If you are more adventurous, it looks like you can try you hand at climbing some of the rock faces. Very cool experience and shouldn't be missed when you are in Vegas.