I asked my wife how she got around in the National Parks of the Southwest.
Everyday, if they were not driving from NP to NP, they would be walking / hiking within the parks.
Typically, they would walk 4 or even 5 hours a day.
Sometimes, they walked back to some scenic spots to see how they look during sunset.
Here is a picture which shows huge rock jutting above you, you walk underneath it as if it is a canopy. The path is narrow and winding; on the edge of the path is a slope which descend quite steeply.
There are of course areas which are to steep. In some cases, ladders are provided for visitors to climb up. There are also areas where the paths are too narrow and dangerous, in such cases, chains on the slope side may be provided.
Of course, in some NPs, mules are available.
Here are a couple of photos, showing the mules.
Of course, some visitors do not seem to require anything to assist in their hiking.
My last photo show a lone visitor wandering among the strangely shaped rocks.