Which part of China? Bejing?
Chengde is about 4H north of Bejing.
See link about Chengde

Vital:
Winter Clothing
SAK
Travel Meds - for ailments like diarrhoea, vomiting
Contacts for embassies, consulates
Knowledge of nearby medical facilities
Travel Insurance

Also, a good sense of humour about the public toilets.
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