The best way to see the United States is a National Park road trip. Explore both Death Valley and Joshua Tree National Parks with this itinerary.
Red Rock Canyon National Conservation Area is a gorgeous spot with a 13-mile scenic loop drive and several cool hiking trails. After, you'll want to head east on Nevada SR 160.
Red Rock Canyon
California Desert Protection Act
Death Valley National Monument was created in 1933 as a conservation plan. The Act abolished the Monument in 1937 and it became Death Valley National Park instead.
Death Valley National Park
Go early to Mesquite Flat Sand Dunes. Try the 2.7-mile Badlands Loop trail at Zabriskie Point & don't forget the salt flats at Badwater Basin.
Alabama Hills is a recreation area in the foothills of the Sierra Nevada Mountains that's cared for by the Bureau of Land Management where you can enjoy epic views of the mountain ranges.
Head in early to the Cholla Cactus Garden. Try the 1.4-mile Arch Rock Trail to see cool rock formations and after stop at Barker Dam to take some pictures of the Joshua Trees.
Joshua Tree National Park
Mojave Desert
The quickest route to Vegas will take you through the Mojave National Preserve which is a scenic drive through 20 million acres of desert region in Southern California.
On your way to Vegas, I recommend a stop to see the Seven Magic Mountains art installation. The art by Ugo Rondinone consists of 7 giant neon-painted stacked rocks.
One of the best day trips you can take from Las Vegas is Valley of Fire State Park. The best two hikes you do not want to miss are the Fire Wave and White Domes Slot Canyon.