It is best to buy tickets for sightseeing tours, show tickets as well as admission tickets online in advance. It is almost always less expensive online. Buying online also saves a lot of time.
You will receive a confirmation voucher and/or e-tickets after you purchase a tour or show tickets online. Please exchange the voucher at the tour or box office on the day of the activity or simply present e-ticket at the venue. Some companies accept e-tickets, other companies require a confirmation voucher. All information such as the venue address, hours of operation and other important details are always included in your confirmation email.