It is called Samda-do, island of three plenties, because of its abundance of rocks, wind and women. It is called Sammu-do, island of three shortages, because there are no thieves, beggars or gates in front of houses. It was known as the Kingdom of Tamna, a kingdom which lasted for 464 years.
It is UNESCO Biosphere Reserve, UNESCO World Natural Heritage Site and UNESCO Global Geopark, and it is one of New 7 Wonders of Nature. It is Jeju Island.
What more? Jeju is the home of Jeju Olle, a series of hiking routes on Jeju Island.