There are no metro or subway method within the island. Google maps isn't going to operate very well in Korea, down load Naver Maps for precise community transportation traces and timetables. Have a T dollars or Cashbee card to purchase the bus. You can purchase on the airport or at https://reid8g07a.blogthisbiz.com/34349823/the-beginners-guide-to-jeju-제주유흥-island-diaries