Our late-October tour led by Canyon Dave's wife, Dora, was a splendid experience. Dora, who is a deeply knowledgeable naturalist, provided us with a great deal more than merely a close-up look at the canyon-- which, of course, is magnificent, but there's a lot more to come away with than just the view. We learned an enormous amount about the flora and fauna of the area-- and of course the geology, which is what it's all about. She also has a terrific sense of humor, and energy to spare. I'd highly recommend this tour, without any hesitation.