I understand Qinghai is a very large province. So far, based on my research, can do a 3 - 5 days trip out from Xining. However, I understand that there's a lot of places in Qinghai that is off limits to foreigners. I think they have a lot of military installations eg nuclear around the province since it is quite isolated. Some local tours also do a mix of Dunhuang and Qinghai attractions together. I was thinking of going to Lanzhou after Xining to do the Dunhuang route.