Watch the Chopstick Placement
Etiquette is everything and it's important to be knowledgeable when you're immersing yourself in another culture. There are many things that you might overlook in your everyday life, so it's important to be aware of the small aspects of the culture that you're visiting.
The main points are: do not rub your chopsticks together, it indicates that you think they are cheaply made; do not point with your chopsticks, it's simply rude as you're using them to put food in your mouth; don't stick your chopsticks straight into the food and let them sit there, it's rude to the person who made your meal.