We are from the UK and had planned to do some kayaking on Lake Powell, but we hadn't realised that it would be quite so hot there in mid September. So we changed our mind. We found Colorado River Discovery by accident. We were looking over the bridge at the Glen Canyon Dam and saw one of the rafts. An enquiry at the Visitor Centre gave us the details and the following afternoon went on one of the best trips we have ever had. Our guide was John and his knowledge was excellent. He was also very entertaining and amusing in the way he delivered his knowledge. It was also very pleasing that he welcomed questions at any time. The trip itself was superb. Rafting between 1000 ft high cliffs, looking at the ever changing rock formations, spotting birds of prey and wondering at the size of the local ravens. They are much bigger than those in the UK. We had a break to look at the ancient rock carvings and I marvelled at what looked like a glacier from a distance. Ok I didn't really think it would be a glacier in temperatures over 90F and it turned out to be a giant sand dune at the side of the river formed form the residue of the local rocks as they get worn away by the wind and water. The trip was so good the time disappeared far too quickly. One of our best accidental finds ever.