1) You got the best advice, take ATM debit card(s). Call your bank in advance. Withdraw as you need it.
2) At least two pair of shoes, for when one gets wet.
3) If you have time, buy some of those convertible pants from long to shorts which zip off. The fabric really does dry overnight after washing in hotel. Bring a small pack of wet towelettes for toilet needs and hand washing. Do not bring any books about Tibet, or maps showing Tibet as separate country.
4) You are on a group tour. You can find other posts on this topic. You will be subjected to required shopping/refreshment stops at stores which kick back money to tour operators and have correspondingly higher prices. Bring a small paperback book to read as your tourmates ooh and ahh over overpriced junk. These will be daily.
5) Do not tip. Anywhere, anytime or anyone. Tour guides sometimes tell you tearfully they do not get paid but rely on tips. Tour guides lie. Bargain everywhere. First offer from 10 to 25% of asking price. Unless you are expert, assume everything is fake or knock-off. That jade and those pearls were injection molded last week from Chinese polymers.
6) Always have water with you to take small sips. It prevents dry throat and cough resulting sometimes from hot smoggy dry air.

This will be a great experience, and hopefully you will return soon on an independent trip. Your itinerary is no better and no worse than typical group tour. Try to get back to Shanghai Museum a second time, as it is the finest you will see, and well worth the time to appreciate the Chinese arts and culture. It also is the best store for classy tourist gifts.