Dougashima Sea Cave Skylight on the Nishi Izu coast is a stunning natural wonder that feels straight out of a dream. This scenic spot is famous for its crystal‑clear waters, dramatic cliffs, and a glowing skylight effect inside the cave when sunlight hits just right. The best way to experience it is by taking a short boat trip from the nearby jetty — usually about an hour — which offers spectacular views of the rugged coastline. Riding along the coast, you’ll see towering rock formations and get an unforgettable glimpse of the cave’s magical interior. Tickets can be purchased easily at the jetty on the day of your trip, and prices vary depending on the tour provider, making it a simple and spontaneous adventure to add to your travel day.