(1) I have been to both Qinghai Lake and Dunhuang during the National Day. In terms of seasonality, Dunhuang is better than Qinghai Lake. When Qinghai Lake went in July, it was beautiful. On National Day, it was bare everywhere, and the scenery was very general. Chaka Salt Lake and Ta &;er Temple were good.
(2) You only travel to Dangti, and you have less chance to get in touch with local customs, but it seems that you don&;t eat flying in the sky or swimming in the water, and there are more Muslim restaurants. Please pay attention to this.
(3) If you want to go to Qinghai and Dunhuang, Qinghai starts from Xining, and the round trip takes at least 3 days, Dunhuang takes at least 2 days, Jiayuguan and Zhangye take 1 day each, plus the round trip and road time, 12 days is more than enough, but I think it will be a better choice to go to Xinjiang in 12 days.