Akaka waterfall at Akaka Falls State Park. Big Island. My love of lava and volcanoes leads me to the Haleakala National Park, a massive shield volcano that starts at 5 km. under the sea and reaches the 3055 meters at the top. Although it spews lava for 200 years, is considered a fully active volcano. From its summit, called Puu Ulaula is possible several walking treks or horseback and 900 meters down into the bowels of the volcano ash filled paths. Although many tourists hurry it up with lost and see cinder cones formed by water and volcanic activity at sunset from the lookout Leleiwi, where thanks to its altitude, and if you're lucky, you can see reflected in a cloud when the sun is about to disappear.