A few photo copies of his passport/visa stashed in a few different locations incase of loss or theft or confiscation of the origional (when outside the US I always keep my passport and about $100 US of local currancy on body in a waist pouch under the clothes), and good directions to the nearest consolate or embassy. And make sure he knows the local laws about carying things like knives, etc., or even prescription meds. I don't know much about travel in China, so YMMV