We tried the Just Live zipline tour with our family of four (daughters aged 12 and 16) and had a blast. The crew is competent and professional, putting the nervous at ease but never losing the sense of adventure we all came to experience. The facility is well maintained and the tour itself is highly organized, but for all that it never has a commercial feel. We did the seven zip/four bridge tour, and as promised, our feet didn't touch the ground for over three hours. It was a hit with everyone, including the rest of our group of ten. I recommend going early - we were the first group through, and I think that added to our enjoyment. Definitely check this out.
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