Some of the world's most beautiful waters and beaches await visitors to southern Thailand, where the names of Andaman Coast towns such as Phuket are well known to backpackers and sun seekers. But there's more to this 16-million-year-old ecosystem than just golf and sunbathing. Dramatic limestone cliffs and rock formations jut from translucent waters of Phang-nga Bay. Rudy paddles through hidden entrances of small islands to find mangroves few people ever see. He meets locals in a seaside village devastated by the recent tsunami as they struggle to rebuild by offering sustainable tourism and home stays to visitors. (7 of 13)