04DAYS 03NIGHTS. DA NANG, the city is in the site of the East Sea and Han River with special different charms. Nature has offered the city a great positon among three World heritages generously, ancient royal capital Hue, ancient city Hoi An and Holy land My Son. HOI AN, In 1999, UNESCO formally recognizes Hoi An as a World Heritage Site. Ancient and peaceful, Hoi An is one of the most popular destinations in Vietnam. HUE is one of the most beautiful cities in Vietnam.