“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. Every Friday, he shares his finds—from jellyfish to messages in a bottle to, yes, creepy baby dolls—with online fans around the world. The strange and fascinating items he discovers, both natural and man-made, garner delighted—and sometimes grossed-out—comments from avid followers of his popular YouTube series and Facebook page.They’ve also…