Antelope Canyon is a must, an unforgettable experience, despite the long, hot day in front of you. Our driver and guide was funny, well informed. Sandra, the guide who took over inside the canyon was very nice, told us a lot of interesting stories about the rocks, the floadings, helped all of us to take pictures. Unfortunately both canyons - Antelope and Horshoe Bend, are overcrowded. Our tour goers were very friendly and one of them saved our trip. After the start of the trip and aproaching Flagstaff, the overhead ceiling kept falling on the driver's head and stopped also the air conditioning system. The driver was unable to see and our trip would have been completely jeopardized; but one of the tour members, a very ressourceful person and a passionate photographer, unscrewed the tripod of his camera and placed it under the driver's ceiling to support it; we were saved. A better revision of the bus is needed before departure. Another suggestion - install some windows shades; we had to soak towels in the ice bucket in order to get refreshed. All in all the trip was fantastic.