Be careful: The thorns of the 'jumping cholla's' are very sharp and painful! Stay on the road when you have small children or pets with you!
Many cholla's are together in the "cholla garden", where a narrow path lies among the prickly plants. BE CAREFUL! When touched the cholla catapults that touched part, the size of an egg, with very sharp spines. My husband got one on (in) his elbow and it took us a painful quarter of an hour to remove plant and thorns. Later (you see these warnings later, most of the time) we saw on a sign a warning for this "catapulting", especially when you have small children or pets with you. I should say: "don't enter the "cholla garden" with children or pets."! You can see enough of the cholla's and enjoy their beauty when you stay on the paved road.
I found a nice website: Desert Flowers in Joshua Tree NP:
WhenI was there they were repairing the road to Key's View. Portions of other roads are also in bad repair. I hit a small portion of a washed out road and bent two rims. Use caution.
There are no bathrooms at some sites and the facilities at some sites that have them are somewhat primitive.
Please remember that it is illegal, not to mention just wrong, to remove anything from protected land like the Joshua Tree National Park. Please help the USA preserve its national heritage.
I found this warning sign very amusing considering how dry it was. Even if there is water around the Barker Dam you should not swim in it.