China - The good and the bad

[DaveOrange]

My wife has always wanted to see the Terracotta Warriors at Xi'an therefore we are thinking of going to China later this year. Kuoni have a tour that seems to fit our wants - Beijing, Xi'an. Yangtze cruise and Shanghai. Having never been to the Far East before does anyone have any tips or advice, things to see, things to avoid, odd etiquette etc
TIA

[DaveOrange]

Thank you all for the tips and comments. I have now booked the trip and we will be going in Autumn. We have travelled to other developing countries before but this is the one that will be most alien to us. It is certainly going to be an experience!