Undoubtedly the best thing to do in Vegas is to rent a car, which, compared with Europe, is very cheap. You'll have a lot of freedom because aside from being able to go to the desert you can also go to any casino you want and park for free with Self-Parking.
It is to the north of Los Angeles and you can pass by it if you go from LA to Las Vegas. It occupies an area of 57,000 km2. It is a desert just like you see in Western movies, with dead trees. The limits of this desert are defined by the presence or Joshua Tree yuccas. It has been said that in the Mojave Desert there are between 1750 and 2000 species of plants living, including cassava. Death Valley is in California in the western desert area, as well.