The Pha Dok Sieo Nature Trail, located in the Doi Inthanon National Park of Chiang Mai, Thailand, is an amazing 3.3-mile out-and-back trip. The trail boasts a stunning waterfall, a river, and plenty of birds, wildflowers,and wildlife as well as unique plants and vegetation. It is generally considered to be a moderate-level trek, with only some steep hills, so it is enjoyable for all skill levels. The best time to visit is November through June; the farmers in northern Thailand tend to burn their fields during the smoky season from March to May. This serene nature trail is worth the hike—the perfect activity for an outdoor adventure!