Ko Samui Airport (USM) is a private airport originally built by Bangkok Airways, which is still the main operator and was for a long time the only airline with services to Ko Samui from mainland Thailand. The airport is additionally served by Thai Airways International. Several ferries connect the island with the mainland, including the car ferry from Don Sak to a pier in the west of the island, south of the main town Nathon. Public buses to all parts of the mainland operate from a small bus station located in the south of Nathon. Songthaews (tuk-tuk style buses) circle the ring road, and private taxis are available throughout the island although these are often criticised for failure to use meters and flagrant overcharging.Article Directory : en.wikipedia.org