-Currency and Foreign Exchange: 
-The Riels Denominations are Riels 100,000; 50,000; 20,000; 10,000; 5,000; 2,000;  1,000; 500; 200; 100; 50. Foreign currencies can be easily changed at most hotels, Airports or at Markets. -Riel to USD (US$1=4,100 Riels) US dollar accepted. major credit cards And Travelers checks accepted  at major place (Hotels, Shops and Some banks).

In Cambodia you should do.
Do: Remove your shoes when entering a temple and at other places where you observe         
      Cambodia people removing their shoes.
Do: "Sampeah" in lieu of the handshake. which is performed by placing the palms of the
      hands together, raising them to the face with the  fingertips at eye level, and inclining the  
      Head slightly forward. For the new generation and the normal people just can say      
      Sousdey (meaning hello) instead of sampeah.
Do: Bargain in shops. Only department stores and expensive shops sell at fixed prices.
Do: Ask for advice if you are uncertain about anything. The Cambodia are very courteous and
      will help you if they can.
In Cambodia you should not do.
Don"t: Sex with children is a CRIME ( Offenders face up 20 years in prison in Cambodia
         as well criminal Proceeding in their own countries).
Don"t: Touch a Cambodia on the head.
Don"t: Point or shake your finger at someone. when sitting, do not allow your toes to point     
         directly at the other person.
Don"t: Stand over a seated Cambodia when talking to him/her.
Don"t: Be impatient when a Cambodia pretends to understand but obviously doesn"t.
         He or She is just being polite. be patient and try again.
Don"t: Raise your voice, shout or call out to people. You will lose face if you shout or loss
         your Temper in public and it will accomplish nothing. If, when discussing a problem with
         Cambodians, they smile or giggle, it is not a sign of disrespect, but rather a nervous
         reaction.
Don"t: Point at someone, especially at face/head. Cambodians believe that we all have a
         guardian Spirit, from the moment we are born and that spirit is usually perched on the hard 
         or shoulder.