Do remove your shoes before you enter someone’s house
Do present things with both hands - presenting anything (currency, cards etc.) to a local using one hand only is considered rude
Do eat when the host offers food, drinks or alcohol
Do finish all the rice in your bowl
Do fill your companion's tea cup
Do thank profusely for a gift received
Don't mind when a stranger wants to practice his English with you
Don't use red ink to write anything
Don't leave chopsticks upright in your bowl - this is an absolute no-no because chopsticks are left upright in a bowl of rice offered to the spirit of a dead person, at their deathbed or in front of their photograph on the household Buddhist altar.
Don't shake your feet
Don't give clocks as gifts - In Mandarin, saying 'giving a clock' is pronounced the same way as the Chinese words for 'attending a funeral ritual' and thus it is bad luck.