Do:
Dress appropriately when visiting a religious site.
Always take off your shoes when entering someone's home or a place of worship such as a pagoda or temple.
Ask for permission before taking photographs of any Cambodian people.
Learn some words in Khmer such as "Hello" or "Thank you".
Visit a local market in the morning to experience the daily life of the local.
Try local cuisine with specialty such as fish Amok and Num Bachok.
Bow a little when you walk between two Cambodian people.
Avoid hugging or kissing in public.