Talking of early evenings, attempt to start out your working day early. A lot of sights open all around 8am or 9am, and shut about 5pm or 6pm; the last ferry from Udo Island will come again just before 7pm. Make sure you download the Naver Maps application in advance https://tourgangnamkaraoke44333.bloggerchest.com/34169029/jeju-island-spot-place-for-dummies