After reading numerous Trip Advisor reviews, my travel companions and I chose Chief Tsosle's tour group and, we certainly picked the best one! We took the 8:30 am tour and had Irene as our tour guide. From the moment you enter their offices to the time you arrive at Antelope Slot Canyon, a marvelous adventure begins. Irene was the absolute best. She explained the canyon prior to our entering it and then quickly helped each of us set our cameras to the exact setting it needed to be to get the best pictures. She did a wonderful job explaining the history of the canyon and the various photos spots along the way. Perhaps the best surprise was when she literally took our pictures for us. Needless to say having an expert take the shots in the canyon made our trip extra special. We all came away with extraordinary pictures of this spectacular spot. I would strongly recommend that you take the first tour available for two reasons; one, the lighting is perfect, and two, there are less people in the canyon at that point. One more note about Irene, not only did she take the time to adjust and take our pictures for us but, she also set our cameras back to their original settings!!!!