Route 55 follows Shikoku's south-facing Pacific coast from Kochi to Cape Muroto — a wild promontory where Kukai (Kobo Daishi, founder of Shingon Buddhism) is said to have achieved enlightenment in a cliffside cave. The cape is a designated UNESCO Geopark; submarine currents bring nutrient-rich water to the surface here, which is why Kochi's famous katsuo no tataki (bonito sashimi) is the best in Japan. Dramatic volcanic rock shorelines, nesting sea turtles in summer, and almost no traffic.
Clone it to your planner, customize dates and stops, then ride. All free.