Kids and champion motorcross riders come together on the North Shore of Kahuku.Subaru Telescope mirror handling equipment (left) and the hexagonal, adaptive mirror segments of Keck 1 telescope with humans for scale (right). Competitor navigates a climbing wall, one of many difficult obstacles found in a Spartan Race.Dive Site: Cathedrals II are big enough to park a tour bus inside. It features the rare, endangered black coral.Finding remote dive sites in Hawaii is always worth it.