I included Chengde in my itinerary because I wanted to visit a place I haven't been to before each time I go to China. It had a couple of UNESCO Heritage Sites and historic attractions so I decided to go.
The Chinese consider Huangshan as one of the most beautiful mountains and landscapes in the country. On one of my trips to China, I decided to see for myself, and I wasn't disappointed.
Guilin and Yangshuo are often part of the backpacking trail after crossing into China from Vietnam. I liked both places and would recommend a stop to either one during your trip around the country.