If you’re in the area check out this 225-sq-km park, which straddles the mountains between Lamphun and Lampang provinces. It ranges in elevation from 350m at the bamboo forest lowlands to 1363m at the pine-studded summit of Doi Khun Tan. Wildflowers, including orchids, ginger and lilies, are abundant. At the park headquarters there are maps of well-marked trails that range from short walks around the headquarters’ vicinity to trails covering the mountain’s four peaks; there’s also a trail to Nam Tok Tat Moei (7km round trip). Intersecting the mountain slopes is Thailand’s longest train tunnel (1352m), which opened in 1921 after six years of manual labour by thousands of Lao workers (several of whom are said to have been killed by tigers).