Let's not be so American and try to bubble wrap the darn thing.
Reasonable precautions and reasonable risk. Barriers for the whole tour are not reasonable.
I remember doing "Suicide Kloof" in South Africa in the early 90s. Hike and swim / jump down a cascading river through a canyon. The whole time I was thinking in the US we would have liabilitied our way out of such fun. And that was before we upped the degree of legally permissive difficulty an order of magnitude or two.