Ask any question about the Canyon and you will get a straight forward, understandable answer. Our guide was well versed in geology, biology, history, and anthropology. He provided just enough information to help us make sense of what we were experiencing, but stopped short of "too much information". Many stops are available, but the stops selected for the tour were well chosen to illustrate points about geology, the river, an human occupation. In addition, our guide was very attentive to our needs and well being. This tour gets an A+ for comfort, interest, and entertainment.