We did the 4 line tour. We waited too long to book the 9 line tour but we were not disappointed. Now we know when we come back to the BI to plan ahead, as we will do this again (9 line). Staff was very professional and we felt safe, even zipping upside down at 160 feet above the beautiful landscape. Bring a wrist attachment for your phone and you can take pictures/videotape your ride. They have reasonably priced food in the cafe for those who don't ride. Also a great hike to overlook the course. Beautiful.