You can enjoy spectacular views along Japan's seashore by boat, but the best way to get up close and personal with the wonders of the coastline is by sea kayak.
In the narrow, closed boat, you can explore caves, paddle among fascinating rock formations, watch schools of fish and see birds diving into the water to catch them. If you are lucky, you might even encounter bigger marine creatures such as dolphins and sharks.
No certification is required to paddle a kayak, but you should learn the basic techniques from a professional, since lightweight kayaks can easily be carried away by high winds or tidal surges.