The Agriculture, Fisheries and Conservation Department announced on August 21, 2026, that a trial reservation system was planned for the High Island Geo Trail–Po Pin Chau Section at the High Island Reservoir East Dam in Sai Kung. The plan, reported that day, covered weekends, the Mid-Autumn Festival and the National Day Golden Week from September 5 to October 7, and applied only to the Po Pin Chau Section; other areas of the East Dam would not require reservations. Reservations during the trial were to be free.

Entry between 9am and 5pm on the listed dates would require a booking. Each two-hour period was to be a session with capacity for 500 people, and total daily capacity was set at 2 000, allocated first come, first served. The dates named were September 5, 6, 12, 13, 19, 20, 25 to 27, and October 1 to 7. Visits outside those dates or hours would not need a reservation.

Booking was to open at 11am on August 24 for September 5 and 6, then every Monday at 11am for the weekend or Golden Week a week later. Real-name registration through the Klook platform was required, with up to five places per registration, and visitors would present an e-voucher and identification for on-site verification. Walk-ins could book on-site if quotas remained.