The others have pretty much covered it. Bring as little as possible, and pick things up along the way.
If you will be taking a lot of photos, do bring plenty of memory cards with you so you can snap away without worrying. One of the things I usually do is stop at either one of those “1 hr” photo shops, or an Internet Cafe, and burn copies of my photos to CD. I make two copies of each CD. I then keep one with me, and mail the other one home. That way if I were to loose or break the one CD, or the worst happens, and I loose my camera (forget it in a cab, or set it down at a market and walk away etc.) I still have my photos waiting for me when I arrive home.
Most of all, bring patience, good manners, and a smiling face, as they will go a long way