You step out of the van into air that suddenly feels thinner and cooler, the road giving way to mossy trees and a steady drum of distant water. Doi Inthanon, Thailand’s highest peak, crowns the horizon; orchids and cloud-forest ferns edge narrow paths while the park’s waterfalls roar like a call to move. This full-day excursion strings together the park’s highlights — Wachiritharn Waterfall’s thunder, the reflective calm at the summit, twin royal pagodas with manicured gardens, and a stop in Ban Mae Klang Luang to meet Karen weavers.