I have always been the sort of person who enjoys flinging myself off cliffs (although I have so much less opportunity to do this as an adult), and one of the things I observed about it in college is that you make the choice to trust your equipment on the ground. Once you're actually in the air, it's too late and there's no point worrying. (And somehow, unlike any other situation in my life, this logic works for me.) But one of the things you do on the ground that allows for that relaxation is check your safety equipment so you know what you're trusting. And a tour like that that follows the same route every time should have something implanted in the wall to clip into and a rock climbing harness. It doesn't need to be super fancy (and with a crowd that's not used to harnesses, probably *shouldn't* be), just enough to keep anyone from falling off.