The Qinghai Yak Museum is the only museum in the world dedicated to Yak culture, making it more interesting than the name suggests. It documents the extraordinary centrality of the yak to Tibetan plateau life across every dimension: food, textiles, shelter, transport, religion (yaks appear in Buddhist art and are used in ritual), and economy. The collection includes yak-hair tents, traditional butter churns, leather goods, saddles, and a full skeleton.
The museum is part of the biotech park in the northern city district, close to the Tibetan Medicine Museum. The two together make a reasonable half-day. The museum is not large but it is genuinely informative and something that most travel museums covering Tibet miss entirely. Free admission.