Years before Google Earth, DNR forester Bill Lockner used hand tools and calculated all the angles and distances to etch ...

The most popular of the items that he sells? Bumper stickers that say, in all-caps, “I Bought This Before We Knew Elon Was Crazy.” For his vacation, Mr. Hiller asked a friend to cover for him.

Still, it’s far from the only thing to see at Joshua Tree. Dozens of trails are open to hiking, biking, and horseback riding, and the stony terrain makes it one of America’s rock climbing meccas.