Two of us are spending two and a half weeks in Vietnam from the end of December. Planning on time in Hanoi, with trips to Halong Bay, Tam Coc, etc, also want to fly to Danang then stay at Hue and Hoi An - at budget to mid-range hotels. I've been told to take some US dollars cash and travellers cheques but am not keen on carrying lots of this stuff around. Does anyone have any advice on how much to take? Presumably it's worth exchanging a couple of bills for Dong at the airport? And how far are credit cards accepted?