We did this as an out-and-back hike to the lower falls. Only saw a couple of other people the whole time. The hike was pretty steep and rocky, with a couple sections containing slippery enough rock that you needed to hang onto the guardrails provided. I can only imagine how slippery these areas would be after a rain. The waterfall at the end was worth it, though. And though we couldn't jump in the water at the waterfall because of the delicate waterfall ecosystem, right below the falls is the Colorado River, which we swam around in for a while to cool off.
"This book will be in great demand by travelers, park visitors, and aficionados of Texas landscapes."