Start your trip exploring the Hanoi Old Quarter, a maze of narrow streets and traditional houses packed with shops, food stalls, and street performers. Walk around Hoan Kiem Lake and visit Ngoc Son Temple. Make sure to stop and try traditional Vietnamese coffee at a local cafe.
Start early for a trip to the UNESCO world heritage site, Ha Long Bay, known for its turquoise waters and thousands of towering limestone islands. Take a cruise and enjoy kayaking, swimming, and visiting hidden caves. End the day by watching the sunset over the bay.
Travel to the imperial city of Hue to see the ancient citadel and fortress, the seat of the Nguyen emperors, their concubines, and eunuchs. Visit the Forbidden Purple City, the emperor's private residence. Take a leisurely stroll along the Perfume River and try the local specialty banh xeo (rice paper crepes) at a street food market.
Take a flight to Ho Chi Minh City, the economic hub of modern Vietnam. Walk along Dong Khoi Street, visiting the Saigon Notre-Dame Basilica and the Central Post Office, both French colonial landmarks. End your trip exploring the bustling markets of Ben Thanh, where you can bargain for local souvenirs and enjoy street food.
If you have more time, consider traveling to the Mekong Delta and experience the unique floating markets. If you have less time, you can skip the trip to Hue, but it's worth visiting if you have at least a day. Be sure to pack comfortable walking shoes and light clothing for the warm weather. Also, make sure to try the local street food, but only eat where the locals eat to avoid getting sick.