Rail biking in South Korea is a fun, unique way to explore the countryside via adapted bikes on old rail tracks. Don't worry, it's not that hard. The Gangchon Rail Park has 3 different courses you can choose from, but I recommend the one way ride with the train ride at the end (there's some fun surprises along the way that make it a really fun experience!). If you visit during the spring and time your visit right, the paths will be surrounded by cherry blossoms!