Take a stroll through some botanical gardens. This is actually one of the nicest arboretums in all of South Korea, as it is both well-established and located up on the lower flanks of Mt Halla at the back of Jeju city. The gardens wind themselves over the foothills, giving tantalising views of the coast and Mt Halla through the trees. The ~2km walk from the arboretum to the rear entrance at the military complex is also pleasant and follows the southern limits of Jeju City through a rather atmospheric pine forest.