Other foreign currencies not readily accepted. US money so common that change will frequently be given in dollars. Unlimited amount of foreign currency can be brought in as long as declared on forms provided by customs officers. Foreign currency exchanged for dong at hotel or at State Bank of Vietnam. Some 1 or 2pm to 4 or 5pm.
Climate varies greatly from north to south.
Tropical monsoons occur May to Oct. Almost totally dry rest of year. Difference in temp. B est time to visit February - March. Low season May - August. Passports should not be used as security for rental of vehicles.