The 6 Zipline package was even better than we had hoped for. As Aussie visitors with a short stay in Denver this tour gave the family a real experience of the Rockies in winter. The whole experience was smooth, efficient and friendly, from our knowledgeable driver Cindy who picked us up in downtown Denver to the drinks and pizza afterwards at the boutique bar adjacent. The guides were excellent instructors with good senses of humour, balancing safety and fun perfectly. Not all my family had zip lined before but the rookies were made to feel comfortable and confident by the guides. The speed and exhilaration of riding the zip lines through the trees and seeing the mountains and sky is just incredible. My family also really enjoyed the short hikes (with light snow on the ground, a bonus for Aussies) from one zip line to the next: the views and clear air were just magnificent. The challenge level is just right: our party ranged in age from 17 to 63 and all loved it. Very highly recommended.