If you can hit the trail early on these days of late spring, you can still sneak into a few lower-elevation destinations before temperatures soar into the misery range. A good point for such a dawn attack might be Keyhole Canyon in the western foot of the Eldorado Mountains about 20 miles south of Boulder City.
Hackberry Canyon is a hidden gem in the southwestern section of the 1.9 million-acre Grand Staircase Escalante National Monument, Utah. It is a bit off the beaten path, but those who make the effort will be rewarded with a colorful narrow canyon complete with a perennial stream, flanked by lush vegetation.
After driving miles of remote desert road through the Mojave National Preserve, Californians are often surprised to come upon the Kelso Depot, where a railroad station large and elaborate enough to serve a small city sits virtually in the middle of nowhere. It serves as the primary visitor center for the preserve, has excellent museum displays and even offers a good place to get a light lunch.