The Desert National Wildlife Refuge Complex consists of four related areas within two hours of LV. The Moapa Valley NWR is not currently open to the public. You can see information about the other three below.

Hedgehog Cactus - Corn Creek Field Station
Mojave National Preserve, about 1.5 hours southwest of LV, features a rich variety of desert environments. Paved and bladed roads make much of the hiking, camping, sightseeing, and wildlife accessible without an SUV. At this time of year, I found the desert in bloom, the Joshua trees in flower, and the desert tortoises active.

Kelso Dunes
Desert National Wildlife Refuge is located in the Mojave north of LV, with three 4WD access points off Highways 93 and 95. Visitors are on their own and should be well researched and equipped for the backcountry. This year's forays were scouting trips for future expeditions.

Recovering Yucca Forest - Mormon Well Road
Pahranagat National Wildlife Refuge is an oasis of lakes along Highway 93 about 80 miles north of LV. Birding, camping, and native rock art are its principal offerings, but it also contains a 4WD access into the Desert National Wildlife Refuge.

Upper Lake
The "Dunes" are more like badlands and the "Recreation Area" is a power toy playground.

Power Toy Tracks
Red Rock Canyon National Conservation Area is <1 hr. outside of Las Vegas. It features a scenic loop drive and hikes of various lengths and challenges.

View Coming Out of Icebox Canyon
Valley of Fire State Park is ~1 hr. outside of LV, with scenic drives and short hikes featuring unique scenery and native American petroglyphs. Popular Hollywood 'alien planet' landscape. Spectacular at sunrise/sunset.
2+ hours outside of LV, on the way to Death Valley, is the Ash Meadows National Wildlife Refuge. Springs fueled by the underground Amargosa River create oases and provide habitat for endangered species of desert pupfish. The lush vegetation and tropical-colored fish are a striking contrast to the surrounding alkaline uplands of the Mojave desert.

Death Valley National Park has a severe and subtle beauty that takes at least a couple of days to appreciate. Go during the cooler weather when you can hike around; it was already getting too hot in late April. ~3 hours from LV.

Mesquite Dunes near Stovepipe Wells