It is important!
Take some time before you travel to study Etiquette in the place where you are going. It can save you from embarrassing yourself and insulting or offending others.
Etiquette is more than just how you eat. It can be about hand gestures, touching others, and even what to do when you see someone naked. Somethings you may find funny may be offensive and things that seen offensive to you may be normal. Talking about money, how to tip (if at all) and cell phone use are a few more. It can be an easy way to start off on the correct or wrong foot.
There are some helpful info graphics here