I wouldn't count on finding film when you need it. Memory cards are easy to find. Definitely check ahead of time. Internet is widely available so that really isn't a problem. I found people very welcoming and photography is not a problem. I was just in rural Yunnan province and I found that people actually seemed pleased that you'd want to take their picture or their child's picture. If there is one recommendation, I'd say try to get out of the cities and tourist areas and go places that few Westerner's go. The place we stayed at is called the Linden Centre which I'd recommend to anyone. Here are some images from near the Linden Centre. A really wonderful place for photographers.