Ketchikan Shore Excursion: Rainforest Zipline Adventure. Spend your time in port in Ketchikan on an exhilarating zipline tour. During this shore excursion to Tongass National Forest, you'll soar above a dense canopy of trees at heights up to 135 feet (41 meters) in the air, cross three suspension bridges and look down on salmon-spawning streams and tidal estuaries. As you zoom across 6,000 feet (1,830 meters) of dual-cable ziplines, you’ll have the chance to spot wildlife like black bears and bald eagles. This advanced zipline course is limited to nine people per every two guides, providing a small-group experience. Book Now and Save 10%: Ketchikan Shore Excursion: Rainforest Zipline Adventure.