The grottoes are fantastics. Easy to go by bus by yourself. The best dumplings I have never eaten. It is good for shopping.
New wall around the old city.
Little town a bit dirty. Everything is quite cheap there compared to other cities in China. The people are friendly but very few of them can speak English.
Stay 2-3 days is enough to visit about everything the city has to offer. I recommend the Yungang grottoes and the Hanging monastery.
Don't travel here during Chinese holidays. The Hanging Temple was super crowded, long lines... We were here during the April holiday.
the newly rebuilt City Walls are fun to visit, Xuan Kong the hangign monesatry is great to see as are the cave at GuangYun.
Datong is a quiet city , the old city center was destroyed in the past years but they are now rebuilding it as it was.
A bit fake but nice to have a walk in the pedestrian zone with fake old buildings