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Thermal Valley, located beside Beitou Park in Taipei’s Beitou District, is one of the primary sources of Beitou’s hot springs and has the highest water temperature in the Datun Mountain range. The billowing sulfuric steam creates an ethereal landscape, earning it the poetic name "Mineral Mist." During the Japanese colonial era, it was recognized as one of Taiwan’s Eight Scenic Spots and Twelve Attractions.

The hot spring pool in Thermal Valley is surrounded by railings, scenic pavilions, and a shallow water channel. While cooking is not permitted, visitors can still soak their feet in the warm waters of the stream, experiencing the soothing geothermal essence of this natural wonder.

Compare to the ＂hotter＂ hot spring of the Datun Mountains, the hot spring here is colder, only about 40。C, so it is called Lengshuikeng (Cold Water Tunnel). The Lengshuikeng was a bowl shape of crater that unfailingly gushed hot spring out. In addition to the unique volcano scenery, there is the individual milk white color sulfur spring, so-called ＂the Milk Pool.＂

The Lengshuikeng Hot Spring is divided into two parts. One is the hot spring cave that is fult of ivory white color powder crystal, only for visiting. The other side is hot spring pool that is turbid and milk white color, also names as ＂Milk Pool.＂ 1911 AD, Yangmingshan National Park Office built two hot spring pools, separated by gender, for free service.

Jingshan Suspension Bridge, spanning across Lengshuikeng Creek, stretches approximately 50 meters in length. It is distinguished by its reddish-brown bridge pillars, black steel cables, and brown wooden planks, standing out strikingly amidst the lush green mountains. Lengshuikeng Creek, rich in sulfuric minerals, is one of the tributaries of the Neishuang Creek, and remnants of historical sulfur mining sites can still be found nearby.

After crossing the suspension bridge, turning right leads to a gentle and well-maintained trail. Along the way, visitors will pass by the Lengshuikeng Ecological Pond, a serene cryptomeria forest, the Jixinlun Observation Deck, and a tranquil forest path. A fork in the trail offers an option to detour toward Silken Waterfall, while continuing straight leads toward Qingtiangang. The journey is a refreshing experience, with shaded greenery, crisp mountain air, and breathtaking natural scenery along the way.

Qingtiangang Grassland (a.k.a. “Sun Valley”) is situated in the heart of the Datun Mountain Range. It is a flat, saddle-shaped area encircled by Mt. Zhuzi, Mt. Qigu, Mt. Ding and Mt. Huangzui that used to be a terrace formed by lava from Mt. Zhugao. Qingtiangang was designated by Japanese colonial rulers as the site of the Dalingzhi Ranch for tea-growing and cattle-herding purposes. After taking over Taiwan, the Chinese nationalist government established the Yangmingshan Ranch in the Qingtiangang /Lengshuikeng area, following the original Japanese tradition. Once Taipei City was placed under the administration of the Executive Yuan, the Taipei City Farmers’ Association became responsible for the ranch operations, with the cattle herds on Qingtiangang being owned by farmers in Beitou, Shilin and Jinshan. With gently rolling meadows and dazzling verdancy, the evenly surfaced Qingtiangang is a wonderful outdoor classroom for grassland observation, and the most popular hiking destination in Yangmingshan National Park, with a foot path impressively lined with undulating grass and stumpy shrubs.