Warning: Do not do this as an ordinary tourist! You need to have an address of record for every night you are in China.
A Visa, a letter of invitation from a Chinese national, an address of record being my hotel. I was so glad to get the hell out. There were reports at the time of westerners being essentially kidnapped by the authorities for the hell of it and held for months.
I was very glad to get all my tickets punched for the ferry to Hong Kong and then my flight to Tokyo. I don't know that I'd have been willing to go back in 2020 and 2021 if there had been no pandemic.
I've been to China four times on business. 3 times to Zhuhai and once to Beijing. The place got meaner and meaner.