Very long, very tiresome trip with not much going on - This is a 13-hour trip, most of which you will sit on the bus. A very comfortable bus, with a great team of a guide and a driver, fun, cheerful and all that, but 13 hours of getting on and off the bus was not my idea of a perfect tour. We got to see the entire canyon, but since you can't stop anywhere, except the designated spots, I felt like I've missed out on a lot of very interesting geology. The dam lakes are very pretty, but you get to the second one, the prettiest, at the very end of the trip, when all you want is to get off the bus and not move. They finish with an hour at an overcrowded spot where people go to spend a day eating, rafting and whatever else. We spent an hour there, which for me, was about an hour too much. All in all, maybe, if the trip was somehow cut in half, with longer stops and more planned activities, I would've enjoyed it better. Otherwise, it's just too long and exhausting, regardless of the excellent agency staff