Best tour I have ever been on. It is a full day adventure but well worth it. Stopped several places along the way both to the park and through the park. Have never met a tour guide (Mel) that knew so much about everything that you will experience from the history, to the geography to the plants and animals of the entire region. She even got us up on three moose and two large bull elk during the excursion. Not sure if this is even possible, but if you are able to request a specific guide, ask for Mel, absolutely phenomenal. Overall, just a fantastic experience. A must-do in Denver.