According to your question, I can provide the following travel plan for your reference, which can be appropriately increased or decreased according to your personal situation:

Day 1: Morning: Arrive at Datong Railway Station and go to the hotel to put your luggage. Morning: Visit Yungang Grottoes to learn about the ancient art and culture of China. Noon: Taste the special food of Datong-kebabs and noodles. Afternoon: Go to Datong City, visit the ancient city of Datong and feel the style of the ancient city. Evening: Taste local delicacies in Datong City, such as roast chicken and roast duck.

the next day: in the morning, I went to Yanmenguan to learn about China's ancient military culture. Noon: Taste Daoxiao Noodles and jiaozi, the specialties of Shanxi. Afternoon: Visit Hengshan Scenic Area and enjoy the natural scenery and ancient buildings. Evening: Stay in Hengshan Scenic Area and experience mountain life.

Day 3: In the morning, I went to the Qiao Family Courtyard to learn about the traditional family culture in China. Noon: Taste the special food of Shanxi-scallion cake and Zhajiang Noodles. Afternoon: Visit Chongfu Temple Tower and learn about China Buddhist culture. Evening: Return to Datong City and taste local delicacies, such as roast chicken and roast duck.

Transportation: 1. You can take a bus or taxi from Datong Railway Station to Yungang Grottoes. 2. You can take a bus or taxi from Yungang Grottoes to Datong City. 3. You can rent a car or take a tourist bus from Datong City to Yanmenguan, Hengshan Scenic Area, Qiao Family Courtyard and Chongfu Temple Tower.

Accommodation: 1. There are many accommodation options in Datong City, such as star hotels, express hotels and homestays. 2. There are many mountain inns to choose from in Hengshan Scenic Area.

Precautions: 1. Pay attention to safety during traveling and abide by local regulations. 2. Protect the environment in the scenic area and don't litter. 3. Pay attention to hygiene when tasting local food, and choose a regular restaurant.