Begin with the natural history displays at the Kilauea Visitor Center, then cross the road to see the Volcano House (+1 808 967 7321), a historic hotel perched on the rim of the caldera. From its parking lot, walk the 0.3-mile [0.5-kilometer] Earthquake Trail for a view of Kilauea Caldera (2 miles [3.2 kilometers] across, 500 feet [152.4 meters] at its deepest) and Mauna Loa, the world’s most massive mountain, rising 32,000 feet [9,753.6 meters] from seafloor to peak. Mauna Loa erupted in 1984, spewing forth a million cubic yards [764,555 cubic meters] of lava per hour and ultimately covering almost 12,000 [4,856 hectares] acres of land.
Now you’ll drive clockwise around Kilauea’s rim, soon entering a rain forest of ferns and red-blossomed ohia trees. Stop at the Kilauea Iki ("little Kilauea") Crater, which in 1959 was a lake of boiling lava with fountains 1,900 feet [579 meters] high; now you see a steaming black crust. Continue to the Thurston Lava Tube (0.3-mile [0.5-kilometer] loop-trail) to walk through a former conduit for molten rock. Among the nearby ohia trees and tree ferns you may see the apapane, a bright red honeycreeper that feeds on nectar and insects.