Me and my son visited the Adventure Course back in November 2015 and had a wonderful time. So much so that we purchased the "Zip Back" pass (a 50% discount off a future visit). So, we made reservations to return on 7 May 2016 (return pass expires after 6 months). The expiration date on the pass was written as 511116, which at first (and second) glance appears to be May 11th. However, when we arrived, we were told the passes had expired on May 1st (this is a manual pass system written on pre-printed cards). So, we had to pay an additional $50 to enter the park. As mentioned by others, on the weekend there can be some substantial wait lines between the different courses as not everyone negotiates the obstacles as quickly as others. The park will not allow you to jump around between courses, they must be done in order. Not really sure what could be done about this, except avoid going on a weekend. We really enjoy the adventure and will probably return. We did purchase the Zip Back passes again and I have put numerous reminders throughout the house, my cell, my son's cell and any calendar I can find so that the expiration date does not slip by again.