Personally, I never suggest brokers. If I do, I'd feel responsible if someone signed up with a broker I suggested and got ripped off.
Not a lot of brokers carry CNY (Chinese Yuan, aka RMB, etc.). I do know that Oanda had it the last time I checked (please note that I don't have a live account with Oanda, so have no info on how good they may or may not be).
Of course, there is always "no leverage forex trading". Go to the airport, check the exchange rates for USD-CNY (or whatever your "home" currency is. Check it both ways, since you want to find the spread. If you see someone heading to the conversion booth with a fistful of Yuan, make them an offer that's 1/2 between the buy and sell rates of the money changers. You benefit, the person selling the CNY benefits, and you can probably get away before the money changers send airport security after you (if you are quick).
Personally, I keep nice pile of RMB on deposit in my multi-currency account at Mattress Bank.
Mattress Bank - protecting your assets since 1929.