Kaumana Cave

In 1881, a lava flow from Mauna Loa helped form a remarkable lava tube near Hilo, and today you can explore a section of it at Kaumana Cave. The cave’s entrance is actually a “skylight” opening into the long lava tube system, and because this area gets so much rain, the opening is often lush and overgrown with plants. Look closely and you’ll see long, thin roots reaching down toward the cave floor—an unforgettable sight.

There is a clearly marked, easy entrance into the cave, but it gets dark quickly. Bring a flashlight if you plan to explore farther inside, and watch your footing on the uneven lava rock. Local history also ties the 1881 flow to Princess Ruth, who is said to have prayed to Pele to spare Hilo—after which the lava stopped short of the town.

More Big Island ideas: If you’re planning a volcano-focused day, consider a Big Island volcano tour or browse more Big Island activities to add to your itinerary.