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Whenever you can, eat street food. It's healthier. Except in the UK of course, where it's awful (- why?)
Follow the good old foreign correspondents' code: "Eat when you can, sleep when you can, sh1t when you can, sit when you can."
As a minimum, learn the local words for please and thankyou. And smile and be courteous. Try to have conversations, however broken or in sign language. You get out what you put in.