Currency
Street cuisine in Vietnam is something you should not miss out on. It makes little difference where you go, but make a point of visiting the local markets to sample the street cuisine. There's nothing special here, although there are a few modest tables set up on the sidewalk or in front of the business, which includes a small kitchen. A large number of locals eat there. These are the telltale indicators of great street cuisine in Vietnam's cities.
US dollars are widely accepted practically everywhere, however if you want to exchange them, keep an eye on the currency conversion rates. There are numerous shops that provide money exchange services. However, because rates vary, it is best to inquire at several places before making a decision. Avoid using the airport's exchange.