“The goal for today is to make it all the way to the thirty-mile marker,” said Jace Tunnell, as the tangerine rays of the sun rose over the entrance to Padre Island National Seashore, painting the flat ocean and tawny beach in terra-cotta. “There’s a signpost down there where the creepy dolls are.” For the past eight years, Tunnell has traveled the shoreline of Corpus Christi each week by four-wheel-drive truck or electric bike, searching for sea-soaked treasures.