Four tourists sustained serious injuries when they fell from a viewing point onto a rocky beach on Larn Island, close to Pattaya, after a wooden railing gave way.
Two days after the accident, Pattaya City officials, led by deputy permanent secretary Kiattisak Sriwongchai, visited the site for an inspection, before ordering major repairs.
He also promised that officials will inspect the viewpoint, which is popular among visitors to the island, on daily basis.
The wooden railing broke after the four tourists reportedly leaned on it to take a photo.
One of the victims suffered bleeding to the brain and a punctured lung.
He is currently under close observation at the Muang hospital in Pattaya.
Two others were sent to Bangkok hospitals for treatment, while the fourth was sent to a private hospital in Laem Chabang in Chon Buri province.
The viewpoint has been closed to all visitors since the accident, pending repairs.
Officials from Pattaya City visited the injured on Sunday and gave each of them 5,000 baht in initial compensation.
Their relatives also demanded that authorities fix the broken railing quickly, to avoid a repeat of the accident, and speed up compensation payment to the victims.