Tianchi (Chinese: 天池; pinyin: Tiānchí) is an alpine lake in Xinjiang, Northwest China. The name (天池) literally means Heavenly Lake and can refer to several lakes in mainland China and Taiwan. This Tianchi lies on the north side of the Bogda Shan (“Mountain of God”, Bogda is a Mongolian word meaning “God”) range of the Tian Shan (“Mountain of Heaven”), about 30 kilometres (19 mi) south of Fukang and 45 kilometres (28 mi) east (straight-line distance) of Ürümqi. It is an alpine drift lake shaped in the Quaternary Glacier period.—Wikipedia
As tourist, you could board the big boat and take a ride around the lake. Mind you, the temperature was quite cold!