Hello! I'm travelling to Thailand, Cambodia and Vietnam during the holidays. I wanted to know if it was possible to pay with euro's and/or US dollars in Cambodia and Vietnam, or if it's possible to change money to the local currency rather easily in Thailand, or in the said country itself? I already have the Thai Baht, but the Cambodian Riel and the Vietnamese Dong are kind of hard to find.
Any advice/information/tips concerning this would be great! Thanks a lot!