Few visitors are familiar with this 116,000-acre portion of the national park, some 24 miles from the Kilauea Visitor Center and accessible only since 2009. But if your timing is right—it’s open just 3 days a week—you can hike through forest and fields that include a cinder cone, tree molds from an 1866 lava flow, and ranch-era relics. Rangers also frequently lead free hikes; check the online schedule. Note: There are restrooms but no drinking water.