Today, our group of 7 (Canadians and South Africans) had a fantastic time out in the valley. Very beautiful. I was concerned when the two instructors were showing off a bit on the zip line. And, of course, the inevitable happened on the last leg of our fun. When lowering us down to the ground, the instructor lost his grip and one of our team crashed to the ground injuring his buttox. Luckily he didn't break any bones, but it was close. Instructors should realise that this is dangerous if not taken seriously. It did put a damper onto the trip.