Khao Sok National Park shelters 160 million years of unbroken rainforest — older than the Amazon, dense enough that its limestone karsts vanish into fog by mid-morning. The park sprawls across 738 square kilometres of Surat Thani Province, its rivers carving channels through Dipterocarp forest and rattan thickets that harbour Malayan sun bears, gibbons, and over 300 bird species. UNESCO recognised the region's biodiversity corridor in 1991, though local communities had navigated these waterways by bamboo raft for generations before the park's formal designation. The Sok River, fed by monsoon rains that average 3,500 millimetres annually, remains the primary artery through the lowland jungle. Multi-activity packages pair traditional bamboo rafting with modern quad-bike trails, elephant sanctuaries, and sea turtle conservation projects along the Andaman coast. The rafts themselves — lashed bamboo poles buoyant enough to carry four passengers — drift at walking pace, propelled by long poles rather than paddles. Guides pole-steer around submerged logs and shallow bends, the current slow enough that kingfishers and monitor lizards ignore passing rafts. The jungle canopy closes overhead in sections, filtering midday light to green shade, while open stretches reveal limestone cliffs streaked with calcium deposits and hosting wild orchids. Bamboo rafting and ATV Khao Lak tours typically run six to eight hours, combining river floats with overland segments. ATV routes climb fire roads through secondary forest, cross rubber plantations, and skirt the park's western boundary where private land meets protected reserve. The elevation gain is modest — rarely exceeding 200 metres — but terrain shifts from clay tracks to laterite gravel demand attention on turns. Operators pair the activities with ethical elephant encounters at sanctuaries near Takua Pa, where retired logging elephants bathe in mud wallows rather than perform tricks. Some itineraries add stops at Ton Chong Fa or Sai Rung waterfalls, both accessible by short foot trails from parking clearings. The Sok River corridor supports over 48 mammal species, including five felids catalogued by camera traps between 2018 and 2024. Rafting routes avoid the park's core zone — reserved for researchers and trekking permits — but pass through buffer areas where macaques forage along the banks and hornbills nest in emergent trees. The limestone geology creates micro-climates: valleys trap humidity and sustain epiphyte colonies, while ridges dry faster and host bamboo stands that flower once every 40 years.