I have been going to Monument Valley and area for the last 25 years. I have always used the same guide- Daniel Chee who runs Daniels Tours out of the Visitor's Center at M.V.- 435 727 3227. You need to ask Daniel to take you personally on the tours- he is quite an expert and is used by many photographers. He can take you to Mystery Valley, Monument Valley, Teardrop Arch etc. and also, organizes a fabulous overnight- sleeping in hogan or outside hogan, dinner etc. wonderful for star trails or plain conversation with a great Navajo guide. His rates are reasonable- one of his daughters works at Goulding's Lodge and another rents horses. Daniel has the knowledge, patience and a great sense of humor. I recently recommended him to a couple from California and they emailed me their photos and marvelous comments- and he is a photographer for Astronomy magazine. Just thought you might be interested..