What documents must I bring with me on the day of the tour?

If it is a domestic tour, you can generally bring your identity. If you can't find it, you can bring other valid documents with photos in your name, such as passport, Hong Kong and Macao pass, Taiwan pass or driver's license (except those who don't recognize driver's license by plane). If you travel abroad, the most important document is your passport, and other documents are generally not needed (some travel agencies require you to bring identification, mainly to apply for temporary documents for returning to China in case your passport is lost abroad)