Lava tubes and sea caves formed by volcanic activity.
Hilo
Kaumana Caves offers an accessible underground adventure just minutes from Hilo on Hawaii's Big Island. These remarkable lava tube caves were formed by flowing molten rock, creating natural tunnels that extend in two directions from the main entrance. The caves provide an easy introduction to Hawaii's volcanic geology without requiring strenuous hiking or expensive tour fees. Located on the outskirts of Hilo, Kaumana Caves attracts visitors with its convenient drive-to access and completely free admission. The main entrance opens into a skylight chamber where natural light filters down, making it an ideal spot for photos before venturing deeper into the tubes. From here, explorers can choose between two directions – one leads upslope while the other descends further underground. The cave system extends for considerable distances in both directions, though the exact length you can explore depends on your comfort level and preparation. Essential items include a reliable flashlight or headlamp, as the caves become completely dark beyond the entrance chamber. Sturdy shoes with good grip are crucial since the uneven lava rock surfaces can be slippery, especially when wet. While the caves remain cool year-round, making them a refreshing escape from Hawaii Island's tropical heat, visitors should exercise caution on the irregular surfaces. The self-guided nature of this attraction allows you to explore at your own pace, spending anywhere from 30 minutes to several hours depending on how far you venture into these fascinating volcanic formations.
Captain Cook
Kula Kai Caverns offers an extraordinary underground adventure through ancient lava tubes formed over 1,000 years ago on Hawaii's Big Island. Located in Captain Cook along the scenic Kona Coast, these remarkable caverns showcase the raw volcanic power that created the Hawaiian Islands. The guided tours take you deep beneath the surface to explore intricate lava formations, including delicate stalactites, flowing rock walls, and cathedral-like chambers carved by molten rock. Each passage tells the story of Hawaii's volcanic history, with expert guides explaining how these natural tunnels formed as lava flowed toward the ocean centuries ago. Kula Kai Caverns caters to different adventure levels with multiple tour options ranging from beginner-friendly walks to more challenging spelunking experiences. The easier tours accommodate families and those seeking a gentle introduction to lava tube exploration, while advanced options satisfy thrill-seekers looking for a more demanding underground journey. The unique geological formations include rare mineral deposits and unusual rock structures found nowhere else on Hawaii Island. Cool temperatures inside the caves provide welcome relief from the tropical heat, making this an ideal activity year-round. Tours operate by reservation only, ensuring personalized attention and proper safety measures. Admission ranges from $35-95 per person depending on the tour difficulty and duration selected. The experience combines education, adventure, and natural wonder, making Kula Kai Caverns a must-visit attraction for anyone wanting to explore the Big Island's volcanic origins from a completely different perspective.
A 500-year-old lava tube located in Hawaii Volcanoes National Park, surrounded by a lush native rainforest. Walk through a naturally lit cave formed by flowing lava.