If your trip to Twimmigi is all locked in but your travel itinerary is a bit on the empty side, let us give you a few hints and tips.Stop by Hallyeo-haesang National Park. It's one sight you'll usually find on many travelers' to-do lists. If you still have some space on that schedule, Skyline Luge Tongyeong and Hallyeo Waterway Observation Cable Car will keep you on the go too.