I found myself using only the nifty-fifty and a 70-200 tele during my month in China (business/pleasure combined). Never saw any need to mount a wide angle lens. Would recommend taking a pocket size camera also, because there were several times that carrying a camera bag or even a standard size camera was out of the question - several hosted dinners, parties with local dignitaries, karaoke challenges, beer parties -- note that our Chinese hosts really liked to sponsor social events in the evenings. Beer was the most preferred drink everywhere we went.
I had just bought a new Canon a week before the trip and had hoped to buy a few more accessories while traveling, but found prices 25 to 50% higher in China than back home (USA). Might help to practice eating with chopsticks before you leave. Many of the small restaurants did not have conventional silverware as an option. We also found that when eating at hosted dinners you did not ask what was being served - just eat and smile (better not to know).
Great place to visit, probably one of the world's safest places to travel today. And countless photo opportunities.