waipio valley road, the steepest road in the usa leading down to punaluu black sand beach in hawaii

waipio valley punaluu road hawaii beach steep steepest 4x4 extreme hawaiian pedestrian ocean foot walking hiking travel tropical tourism volcanic coastline island nature pacific black sea sand shore water big green lava landscape outdoors rock coast wave famous photography popular spot surf vertical beautiful beauty blue cloud colorful exotic hike outdoor palm palms paradise recreation rocky sky summer trail trip tropic vacation warm wild wilderness wildlife