1. Jeju Udo Island Udo Island is a small island 15 minutes away by ferry from the main island of Jeju Island and is a popular tourist destination with its beautiful emerald-green beaches. It is often used as a filming location for dramas and movies, and many people will think of Udo when they think of Jeju Island. It is good to enjoy marine activities such as bathing or diving, and to take a wal..