By The Nation
Hard objects were used to scrawl names and messages along the 200-metre passage, said Somboon Ngafa, chairman of the Railay Bay Tourism Association Club.
The beach and bay itself are under the aegis of Haad Nopparat Thara-Phi Phi National Park.
Somboon said park officials often warn and reprimand tourists about marking up the cave passage, but there’s not enough staff to keep close watch.
The club has asked the operators of resorts on the beach to appeal to tourists to forego any such activities.