Amazing Zipline Tours in 2 LOCATIONS. Our Cliffside Zipline is just 30 minutes from Denver and our Mountaintop Zipline is near Buena Vista! Whitewater rafting at both locations. Scenic mountain locations built amidst natural features. Both of our zipline courses utilize platforms built into the the trees and rock outcroppings of the land. Our Idaho Springs course is on 9 acres and our Granite course near Buena Vista is on 44 acres. Find great deals from AVA, on our web site at www.coloradorafting.net! AVA offers the best whitewater rafting near you on 8 rivers for all ages and abilities, beginner to the most advanced. FREE wetsuits/jackets with AVA trips Trips 30 min. from Denver and 1 hr. from Breckenridge, Keystone, Winter Park, Vail, Aspen, Steamboat and Boulder. AVA: We Guide Colorado!