I went to the Denver Adventures Zipline tour with a work group for a team building exercise. It was a very enjoyable experience. The ziplines are high, fast, and long away for you to get great views of the scenery. Our guides made everyone feel safe and comfortable with the activities, they also had us laughing throughout the tour. I will say there is a hike that was challenging for some people in our group, for many of us it was our first time walking at that altitude. All-in-all I couldn't recommend this activity more highly definitely give these guys a look if you have the time.