Yeosu Haeyang Rail Bike is an activity in Yeosu where riders pedal a rail bike along the coast and through a tunnel. The 3.5 to 3.6 km round-trip course runs downhill to the turnaround point, and about half of it passes through a tunnel. The ride takes 20 to 30 minutes round trip, with a photo section in the middle and a turnaround point with a rotating floor. The course is short, and on the uphill return riders must keep pedaling.