Dear Charlie，
I am glad to hear that you are enthusiastic about Chinese cultures，As a consequence, you and your family will travel to China during the lunar new year.I want to show you a sincere welcome and I am going to tell you something about the operations for the trip.
First of all, you'd better convert dollars into enough even for consumption.Secondly, as the saying goes, when in Rome do as the Romans do.It is also of great importance to learn about Chinese customs.In addition, you are expected to prepare some maps in case that you get lost.What's more, I suggest that you learn some everyday Chinese which can help you to avoid misunderstanding others' meaning.
Have a good time, I am looking forward to your reply at your earliest convenience.