The round-trip train fare seems to be 240 per person for a hard seat, 500 for a sleeper berth, and about 200 per day for a standard room. Meals, tickets, and shopping are all more or less.
Last year, my wife and I spent about 4,000 yuan on a three-day trip to ***, mainly shopping. We went to the Zoo, Xidan, Xiushui and Sanlitun to buy things, and then we just looked at Qianmen and Houhai.