Unbelievable! My wife and I took a 7 day Inside Passage cruise and this was by far the best experience of our trip. Climbing down into a cave under the Mendenhall glacier was something unexpected and was the best part of the trek. The hike to and from the glacier is no joke so be prepared for a very challenging day. I have climbed many mountains in Colorado and this was as difficult as any of the climbs I have done.