I haven't done the zip line in Ketchikan but have done them in Jamaica, Puerto Vallarta and here at home. The one thing they all had in common was that you did have to do some walking up hill. The zip line in Puerto Vallarta was very strenuous and I wouldn't recommend it to anyone who has any mobility or health issues. The one in Jamaica was fairly easy and could have been handled by anyone who didn't have a mobility problem.
If you do have a mobility problem then you may want to rethink it. It isn't easy getting back down if you become injured.
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I want to book the zipline in Ketchikan, but need info on how strenous it would be. Heights are no problem, just want to know how much walking, climbing, etc. Has anyone done this?
My wife and I did the Ketchikan zipline last summer and it was an absolute hoot and we're in our 60's. One cool thing is that you go from tree platform to tree platform that are sometimes connected by swinging bridges. Once we looked straight down and saw a bear with 2 cubs about 100 feet below. Don't miss it. I thought all ziplines would be as much fun and tried one in Maui that was definitely forgettable.