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So after surviving the zip lines, we trekked up the 28 miles (switchbacking) to the Haleakala crater. Sunset was magnificent...very cold at 10K+ feet but better than freezing while waiting for sunrise. When you go right from sea level up, it's high. I have tons of photos but this is one of my faves. We could see over to Mauna Kea and Mauna Loa on the Big Island.