Best Cave Adventures (Outdoor Activities) in Miyako Island for 2026 | VELTRA | Tours, Activities, & Things to Do Discover Japan’s mystical caves and stunning coastal adventures, from the famous Blue Cave in Okinawa to the breathtaking Pumpkin Cave in Miyako Island. Explore hidden sea caves by kayak or SUP, snorkel in crystal-clear waters teeming with marine life, or dive into the depths with expert guides. Whether you’re seeking an adrenaline-filled adventure or a serene nature escape, these cave exploration and water activities offer unforgettable experiences for every traveler.