take a tour to see the site's and a good way to do a recon.If your in Bejing and have to go to the" head" try to use a hotel or "the Big Mac"thier usualy very clean,if not be prepared to pay for the use of toilet and to squat over a hole.Don't put anything on the floor. Get a shoulder bag to carry your paper work and water ,hand sanitizer and lot's of napkins, it 'll blend in better than a backpack.Weather wise think New York in March