This was one of the best experiences and if you can swing it, take the tour from Cody, WY to Yellowstone. Our guide was named Sean and he was loaded with information not only about Yellowstone, but about the formation of the gysers, the Eco-system, etc....things you just do not find out on your own. He was patient and kind and took all the time needed to let us look and take pictures. He knew all the best roads to take and what was happening in Yellowstone regarding the animal habitats and over features. We saw bighorn sheep, elk herd, bison, and many different birds, old faithful, geyer fields, the amazing falls, beautiful steams, lakes, and had a tasty picnic...we saw it all. If we had done this ourselves we would have missed a lot. Great, great amazing day!!