Keep the pass, booking confirmation, payment records and the terms applying at purchase. Photograph closure signs, barriers and the entrance to the detour. Record the date, time, affected route, waiting periods and lifts that were actually usable.
All information from the operator and production can matter. Keep notices, app messages, emails, plans and later changes. If employees or other guests gave information, record their names and the substance of the conversation promptly.
Arrange the documents chronologically. This shows what information existed before purchase, at entry and after a complaint. A clear account should separate the cause of the closure, remaining use and the specific compensation requested.