According to Top China Travel's website. Here are the most visited places in China.:

1. Beijing

2. Shanghai

3. Xi'an

4. Hong Kong

5. Guilin

6. Guangzhou

7. Chengdu

8. Hangzhou

9. Suzhou

10. Sanya

I personally love Guilin because of its scenery, environment, and air quality. I studied in a Chinese language school in Yangshuo which is a county in Guilin and I really love my stay. I've been to other cities as well but nothing is compared to Yangshuo.