You'll pass the small village of Sai Wan where you can refuel with a snack or a drink, but continue along the clearly signposted, paved path until you reach Ham Tin Beach (find step-by-step directions here).
To refuel between rides or while waiting in the lengthy queues, you can buy a steamed bun -- originally a traditional Chinese delicacy with hot, sweet or savoury fillings -- from Boiler Room Bites in Adventureland.