Comrades have already provided some really good advice in this thread—I’d just like to add that Chinese people are pretty chill about foreigners unless they start acting like shitheads (being chauvinistic, pointing out flaws in everything, mentioning politics in conversations etc). Other than that, enjoy your visit. Things really feel different when you visit a country with thousands of years of history. I was there for a year and feel like there’s still so much to experience.