Encircles Kilauea's summit caldera; passes through desert and rain forest. View Halema'uma'u and Keanakako'i Craters and Mauna Loa. Of interest: Plants, birds, insects, desert, rain forest, steam vents, caldera, craters.

• Difficulty: Challenging
• Distance and hiking time: 11-mile loop, all day
• Trail begins at the Kilauea Visitor Center.
• Be prepared: Bring water and food. Be prepared for hot and dry, and wet and windy weather. Expect sulfur fumes in the Halema'uma'u Crater and southwest rift zone.