What is in common currency among?

Chinese Currency
The Chinese currency is Renminbii (RMB), generally pronounced Yuan in written form, but spoken as Kuai. Note of 1, 5, 10, 20, 50 and 100 are the main paper currency.

Exchange rates:　$1 US = 7.4 RMB approx.
Foreign currency can be changed in most banks and hotels. Exchange rates do not vary that much, so hotels are often the most straightforward place to exchange. It is important to retain exchange receipts, these are needed to convert Renminbi back into foreign currency when leaving China. You may convert up to half of the amount of Renminbi shown on your receipts..Maximum 5000 US dollars are allowed for exchange in one single day.

Cash
Cash is most convenient method of transaction in travel, especially when consuming at small shops in Sanya. Foreign currency, mostly US dollar and Hong Kong dollar are accepted at such places as high-star hotels, golf clubs etc. Except for these locations, cash is king, so it is best to be prepared to get Renminbi for most expenses in Sanya, unless you are going to stay in the hotel for the whole day, and the hotel can charges all expenses to your room.

Credit Card
Basically, credit cards are only accepted in major tourist hotels, shops and restaurants. The locations accepting credits cards would put up a post to remind the guests. But something needs to be cautioned, that is some outlets can only accept Chinese credit cards due to their business nature. Therefore, before addressing your bills, you should check it out so as to avoid involving in trouble.

Traveler’s Check
Generally speaking, traveler’s check is not quite popular in Sanya, only accepted by some branded international hotels. Note that you will not be able to use traveller's checks directly for purchases.