The excursion offers a simple solution to a tourist's logistical complication of how and where and when. For this reason, you're bound to encounter a inharmonious combination of people with unique motivations and goals for their travels. This was my observation on my first excursion ever.
First, there is an Italian couple in their early twenties, feverishly enamored with one-another yet indifferent to the stunning scenery. He spends most of the tour inventing new angles at which to capture his love on film, while she works on her blasé stare into the distance. In the Garganta del Diablo (Devil's Throat), a tremendous rock formation created by an ancient waterfall, she lies down and stretches across the rocks on her side, posing for her eager camera man.