We were doing the tour on Tuesday, June 15. Came early, exchanged the printed voucher for ticket and waited in line. It was record high hot that day. Poor arrangement management made us wait extra 15 minutes in line when it was unlively hot outside. Nobody made long line of visitors aware but it was obvi that touts were oversold. MAKE SURE YOU HAVE Water with you! It's impossible to survive without it. It's not included with the tour or offered for sale on the bus. Loved our guide and driver, no issues there. But organizing busses staff must be scrutinized for making people with kids having traumatazing experience while waiting for busses in this weather