We had booked our day tour to see the Underground River, which has been declared a UNESCO Heritage Site as well as one of the new 7 Natural Wonders of the World. Unbeknownst to us, there was actually a morning stop at Ugong Rock before we made our way to the Underground River. Initially, I was annoyed that we would have to sit around and wait for an hour or so while the only person in our tour van who had paid for this ahead of time was to go up the rock and zipline down. Fortunately, the friend I was with convinced me to go as it was inexpensive and was better than doing nothing for an hour. Not that difficult to convince me under those circumstances, to be fair.