I take my summer vacation into the mountains , not the sea . Even in the mountains , it is over 700 m , where it is piled up in clouds . There is no heat in the clouds . In this condo , you have to sleep under a blanket at night even in midsummer . So I prefer the mountains to the beach . The slope is quite difficult to the top of Mount Homyeong . The 2 . 7 km uphill is by no means light . If you go up about two - thirds , you will find an observatory where you can relax . There are also several chairs . From here , you can see Cheongpyeong Lake . There is a heliport at the top of Homyeongsan Mountain , which is 632 m above sea level . You will walk on the ridge from the top of Homyeong Mountain to Homyeong Lake . From the top to the lake , it is a smooth ridge of about 3 km . As you climb and descend the cozy forest path , you feel the dense forest . Homyeong Lake at the top of Homyeongsan Mountain has a reservoir above the Cheongpyeong Pumping Power Plant , a pure pumping power plant . Homyeongsan is not high , but deep . Throughout the walk , you can see a deep forest . The trail to Homyeongsan Mountain starts at Cheongpyeong Station and goes down to Sangcheon Station through the top of Homyeongsan Mountain and Lake Homyeong . It is a 12 km course . .