Amanzi and I booked to go abseiling last year when we went camping at Glenworth Valley. Unfortunately that week-end it rained, so they cancelled the abseiling. They don't refund the money, but do let you book the event any time within 12 months.
I suddenly realised that this week-end was the last chance we'd get before the expiry date, given the US holiday we're about to take. Fortuitously Amanzi had someone covering her shift this morning at Bakers Delight. So we booked it up, then jumped in her car at 8:30 and legged it out to Glenworth Valley