书面表达：(One possible version)
I’m delighted to know you are coming to China with your family during the Chinese Spring Festival, which is a great chance for you to experience Chinese culture personally. Here I am writing to offer you some advice.
It would be a good idea if you could make some preparations before your travel. First of all, learn some simple Chinese, especially the daily expressions, which makes it easier for you to communicate with the locals wherever you go. Besides, to get yourself familiar with some Chinese local customs and traditions may help you behave properly during your stay. What’s more, you can learn how to use chopsticks beforehand so that you can taste different varieties of Chinese food more conveniently.
I hope you will find my advice helpful. Wish you a pleasant journey in China.