The rugged Shuangqiao Valley (双桥沟, Shuangqiao Guo) is accessible via the Balang Highway running from Siguniangshan (Four Sisters Mountain) and Rilong and is a favorite for climbers—especially ice climbers. The valley is protected, so you need a permit to get in, which can generally be arranged by regional travel agents and some hotels (you'll still likely have to appear in person with your passport and visa before the appropriate officials). The easiest way to go, however, is to book with a major tour provider beforehand—Ctrip, for example, books Siguniangshan tours online.
Suangqiao Guo is the most accessible valley in the Siguniangshan area and features a well-marked path running the length of the valley along with occasional signs marking a notable rock formation, view, stand of trees or small stream. The views of the Four Sisters are wonderful from the valley if the weather permits. Suangqiao Valley gets very cold at night and there is little in the way of camping or climbing supples anywhere nearby, so be sure to bring what you need in with you. For climbers, the valley provides at least two good weeks of climbing along routes that range in difficulty from medium to hard.
Sichuan travel guide | Aba guide | Chengdu flights | Chengdu hotels Aba tours & activities | Tibetan culture in Sichuan