Canyon Dave gave us our tour and we had a wonderful time. He has lived, hiked and studied the Grand Canyon for many years and his knowledge has depth and breadth. As a geology professor, he explained the geology of the canyon in a most interesting manner. He had rock samples for us to examine as he instructed us on the formation of the canyon. We visited several areas of this massive place as he told stories of the flora and fauna. For lunch, we went to a Navajo Reservation for authentic food which was delicious. There is also a store, museum and studio of wonderful art. Dave is an excellent guide and we highly recommend his tours.