Jeju Island is a volcanic island, dominated by Halla-san (Halla Mountain): a volcano 1,950 metres high and the highest mountain in South Korea. The island was created entirely from volcanic eruptions approximately 2 million years ago.
Some tourist attractions are water sports, jet ski, snorkling, etc. You can take submarine ship and enjoy the underwater view.
The ship that took us to submarine ship. I was too excited discussing about korean dramas with Kathy, our local guide, that I forgot to take photo of submarine ship.
Dancing fishes taken inside the submarine ship
Jeju Island, South Korea, September 2009, by v1olet