Nothing beats chilling out by the water while you're on vacation. Enjoy a picnic at Cheongpyeong Lake and then stick around for a lovely sunset.
You'll be spoiled for sightseeing choice when spending time in South Korea. Cheongpyeong Lake is a good place to start here, but there are lots of other fine attractions to enjoy. The Ananti Club, Petite France, and Gapyeong Sledding Hills are not far from the body of water and and will cap off your day nicely.