Went to Zoom Air in the off season (mid September). I was for a while the only guest at the park. The staff was very friendly and helpful and the courses were a blast. I used muscles I didn't even know I had, I sure felt it the next day!
I highly recommend Zoom Air, even for those who are afraid of heights, once you're in the harness and tied into the tree you lose the fear and when your on the zip lines the last thing you'll think of is how high you are, it's just too much fun!
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