Doi Inthanon National Park. The highest peak in Thailand, Doi Inthanon rises to a height of 2565 meters or 8, 415 feet above sea level. This altitude means that temperatures on Doi Inthanon are refreshingly brisk year round and regularly dip below freezing during the cool season . The national park which contains Doi Inthanon and bears its name covers 482 square km and contains Sanpatong District, Chomthong District, Mae Chaem District, Mae Wang District, and the Toi Lor Sub district of Chiang Mai Province.