Hello! We will be heading to China from Dec 8-18. After a quick overnight we will take the high speed train from Beijing West to Xi'an spending three nights there. Then stopping in Pingyao for one night before returning to Beijing. That leaves me with about 4 days to burn before returning to the USA.

I have been to Beijing twice and have seen what I want to see, so I am trying to figure out a good place to visit to burn 2-3 days.

Any advice?

ETA we are looking at Datong...