Natural Study trek on Doi Inthanon Kiu Mae Pan starts from Km. 42. This short trail, winding through pristine forest for about 2.5 kilometres, a 3-hour walk, allows the hiker to experience the natural beauty of the forest at first hand. The Rhododendrons, commonly found in the Himalayas, are found along the trail and they are in full bloom during December-February. Trekkers on this route should seek permission from the park headquarters at Km. 31 for safety reasons. A group of not more than 15 people is recommended. Food consumption is not allowed while trekking. This nature trail is closed for reforestation from June 1 to October 30 annually.