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Most mornings, hundreds of visitors arive at the
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Most mornings, hundreds of visitors arive at the summit between 5 a.m. and 6 a.m. to watch the sun rise over the rim of Haleakala Volcano on Maui, about 10,000 feet above sea level.(Credit: MCT Photo/)

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Haleakala, Hawaii

If you stand along the road by Sunrise Market in the hamlet of Kula, on the island of Maui, you'll first hear the buzz, then with a whoosh the bicycles come around the bend. They're riding 27 miles, following about two dozen hairpin turns, rolling past hardened lava and cane fields, fruit stands, lazy livestock and three small towns. And 99 percent of it is downhill.