As the highest summit in the country, the views afforded atop Hallasan Mountain are absolutely phenomenal in all seasons. How about traveling to an island of the island? The view of Jeju Island from islands such as Udo Island, Marado Island, Biyangdo Island, and Chujado Island will be fantastic. And including Saryeoni Forest, which are known for its dense and leafy forests, a trip with friends and family will prove to be a great retreat too.