Jeju Island is known as the "Hawaii" of South Korea. I have never been to Hawaii, but I can confidently suggest that the Koreans should start searching for another (less exotic) island to compare Jeju to. Now, don't get me wrong, Jeju is great. In fact, it was my favorite region of South Korea. It is just not at the same level as Hawaii (I'm telling you this so you are not dissapointed when you step off of the airplane). Anyway, there are many activities you can do on Jeju Island. I was there for four or five days and still did not see it all. You can go to numerous beaches, hike up the volcano, visit folk villages and other islands, relax in a hot spring, see the infamous penis park, ect, ect! It is the best place to vacation in Korea.