in joshua tree, for example, there are only two small areas with reservation campsites. the rest are first come first serve. so if you show up for a weekend wit

in joshua tree, for example, there are only two small areas with reservation campsites. the rest are first come first serve. so if you show up for a weekend without a reservation which is extremely difficult to get because joshua tree is very very popular, then you might not find any camping at all, or have to drive around for a long time trawling for an open or soon-to-be-open site.