Douglas Island Zipline Tour from Juneau. Experience the Alaskan wilderness from the treetops on a zipline adventure from Juneau. First, enjoy a short, high-speed boat ride across the Gastineau Channel to Douglas Island and an off-road trip through the rainforest; then soar through the air on 10 ziplines, admiring views of the dense forest canopy below. See natural and historical attractions like Bullion Creek and the old Treadwell Mine, and end with a rappel descent from the final platform. Book now and Save 10%: Douglas Island Zipline Tour from Juneau.