Sitting at the border of Sichuan and Gansu provinces, the town of Langmusi 郎木寺 (called Taktsang Lhamo in Tibetan) is filled with a mixture of Tibetan, Han, and Hui people. The town, although best known (as many other places in the area) for its horse trekking, is also very well known for its two separate monasteries, one in Sichuan and the other in Gansu. These are an attraction, but the real beauty of the town lies within its picturesque scenery.
When visiting the town, pack a lunch and then walk on out: Regardless of which direction you choose, you'll find beautiful valleys. Langmusi is also one of the few places where Tibetan sky burials are carried out.
Visiting in the wintertime offers a different view than the usual since, like Jiuzhaigou, the area is best known for travel in warmer weather. This means also that wintertime visitors will find a distinct lack of tourists within the town and on the trails, which offers enormous appeal to those who cringe at the tourist crowds. Likewise, accommodation is plentiful and cheap (RMB25 to 40 for a private room).
When trekking through the hills there, mind the elevation (approximately 3,300 meters), and try not to push yourself too hard. Give yourself time to acclimate before venturing off full strength. In terms of temperature, a decent jacket and some thermal underwear should be enough by day, but after the sun goes down, you may find yourself wishing for a proper down-feather jacket or another layer.
From Chengdu's Chadianzi bus terminal, take a bus to Ruo'ergai (若尔盖) and then catch a bus the following day to Langmusi.