Kilauea, in Hawaii Volcanoes National Park, is currently ranked among the most active volcanoes on the planet. The park has many trails, ranging from a quick walk through a lava tube to multi-day hikes. Among the most popular: Kilauea Iki Trail — a 4-mile loop trail through Kilauea Iki crater, the remains of a massive 1959 eruption. The trail begins off the park’s Crater Rim Drive near the Thurston Lava Tube. Its more than 400-foot descent takes hikers through a variety of scenery—lush fern- and foliage-filled rainforests, with native birds in the trees, near active steam and sulfur vents and across a long-solidified lava lake. Follow rock cairns across the crater floor. Bring sunscreen as well as rain gear as daily weather can shift from warm and sunny to cool, wet and windy.