chapotraphouse

Never been to China, but I can offer basic generic travel tips:

Adjust your sleep schedule weeks before you leave to avoid jet lag. Much better to have a few unpleasant "jet lag" days at home before you leave than missing out on fun stuff the first few days while you adjust.

Learn what basic medicines look like over there and what to ask for at a pharmacy. It can ruin a holiday if you're stuck with a headache and no paracetamol or anything. Also, if you've got a kid, knowing what child friendly medicine exists over there is always a good idea. You don't want your kid to miss out on their holiday either.

Don't feel like you have to spend every second "doing something" either. Sounds like you'll be traveling around a lot, so having the occasional "rest day" can make the whole experience a lot more fun. Don't just assume you'll be able to rest on the train or plane.

If you or your wife are a light sleeper, investing in some earplugs and eye covers could make it much easier to sleep, especially if you're sensitive to sleeping in unfamiliar environments. Especially if you're going to be taking a nap on a train or something like that.

A lot of this is probably very basic stuff you already know, but I still like to share it, just in case.

Have fun!