Mureung Byeolyucheonji in Donghae is a theme park built on a former limestone quarry. It looks out over the emerald Cheongokho and Geumgokho lakes, with a lavender garden, luge, zipline and sky glider. A lavender festival is held in June, and a shuttle carries visitors up to the luge observatory so they can look around on the way down. The many uphill sections make walking tiring.