I was in Denver in January and decided to go on this tour as I had some free time. I travel a lot both for leisure and for work. I have visited places by myself on tours and with colleagues and family. I was travelling solo for work so decided to book through this company. I am so glad I did as I only had a few days free and I wanted to get the most out of it. Our guide Guy Sloan Duvall was really great; the small group I was part of wouldn't have had such a great tour if it wasn't for his knowledge of the areas, perfect planning and great advice of where to get great pictures. For places like this I really believe you need to go with an expert from a safety perfective and to receive a once in a lifetime tour or you would miss out, money well spent. if I didn't go on the tour I wouldn't have got the in depth knowledge of the geology, animals, history and landscape. I would do this again if I was in the area and I have recommended this company to colleagues and family.