We mistakenly reserved the Aerial Challenge through a Groupon and once we arrived and discovered our mistake, the staff at Advertureworks were quick to remedy the situation and easily switched us to the zipline tour at no additional cost. Now that's what I call customer service! We had a great zip with Michael (lots of jokes, don't encourage him ;) as well as the very sweet young lady who checked us in (I'm sorry I don't remember her name). There were a total of 10 ziplines, each of varying lengths. It really was a great experience and highly recommended!