Shimanami Kaido, Japan An awe-inspiring bike route, this connects the main island of Honshu with the smaller island of Shikoku. A network of roads and bridges strings together six islands to create Shimanami Kaido, a special cycleway over the scenic Seto Inland Sea. Start at Onomici for the great day trip, at 60 km, but we’d advise you to take a few days and detour to take in the ancient shrines, famed citrus groves and a lemon-infused spa bath.