I spent a good bit of my time at Petit Jean hiking trails, although I never took the trail to the base of the falls. But I did take some pictures along the way:

We hiked down this trail to get to the bottom of the gorge. The steps were cut into the rocks by Civilian Conservation Corps workers in the 1930s.

A fairly typical outcrop along the trail...
It always amazes me the way nature arranges things...

This was a small cave along the north wall of the canyon, big enough for a group of 5-6 people to shelter in.