As far as food goes, you can’t go wrong with vietnamese cuisine. Make sure you don’t leave the city without eating pho (a vietnamese soup in many varieties: pork, chicken, beef, veggie, etc), vietnamese coffee, banh xeo (crepe with pork/shrimp and herbs), goi cuon (spring rolls), and banh khot (vietnamese pancake), just to name a few.
Vietnam is located on the mainland edge of Southeast Asia with a population of over 100 million. It has an extremely eventful and tumultuous history over the entirety of its existence but has recently become a popular tourist destination while in Southeast Asia. Some cities to check out while in Vietnam include Hanoi, Ho Chi Minh City, Nha Trang, and Hoi An as well as Ha Long Bay and the Mekong Delta.