Honeymoon in Vietnam

1. Day 1: Ho Chi Minh City
   Arrive at Tan Son Nhat International Airport and check-in at the hotel (30 minutes, 7.5 km). After settling in, visit the War Remnants Museum (20 minutes, 3 km) to learn about the Vietnam War. Then, head to Notre-Dame Cathedral Basilica and Saigon Central Post Office (15 minutes, 2.5 km) for a glimpse of French colonial architecture.
2. Day 2: Can Tho
   Catch an early flight to Can Tho (1-hour flight) and visit the Cai Rang Floating Market (30 minutes, 7 km), the biggest in Mekong Delta region. Enjoy traditional breakfast of hu tieu (Vietnamese pork noodle soup) from one of the vendors on the river before visiting Bang Lang Stork Sanctuary (1.5 hours, 25 km) to witness the beautiful bird migration. Spend a romantic evening at the Ninh Kieu Night Market (30 minutes, 7 km), shopping and strolling around the river bank.
3. Day 3: Hoi An Ancient Town
   Take a 1-hour flight to Da Nang, then transfer to Hoi An (45 minutes, 30 km). Visit the Japanese Covered Bridge (15 minutes, 1.5 km) in the heart of the historic district. Next, enjoy a ferry ride along Thu Bon River (45 minutes, 7 km). Later, visit the colorful and lively Central Market (10 minutes, 1 km) for some souvenir shopping before ending the day relaxing with sunset drinks at the An Bang Beach (10 minutes, 4 km).
4. Day 4: Hue
   Take a 2.5-hour scenic drive along the Hai Van Pass (135 km) to Hue. Start at the Imperial City (1 hour, 5 km), the royal palace of the Nguyen dynasty. Continue to the Tu Duc Tomb (30 minutes, 7 km), the tomb of the fourth emperor of the Nguyen dynasty, renowned for its beautiful architecture and tranquil surroundings. End the day with a flavorful spread of Hue cuisine for dinner.
5. Day 5: Halong Bay
   Take a 2-hour flight to Hanoi, then a 4-hour drive to Halong Bay (180 km). Board a luxury cruise for lunch and a glimpse of the stunning karst islands. Take part in kayaking, snorkeling, and swimming in clear waters. Enjoy dinner on board while being mesmerized by the scenery of the bay.
6. Day 6: Hanoi Old Quarter
   After disembarking the cruise, head back to Hanoi (4 hours, 180 km) and visit the Ho Chi Minh Mausoleum (30 minutes, 3 km), a tribute to the revered leader of Vietnam. Next, visit the Temple of Literature (30 minutes, 2.5 km), Vietnam's first national university, founded in 1070. End the day with a visit to Hoan Kiem Lake (20 minutes, 1.5 km) for a romantic stroll before departing from Noi Bai International Airport.

Time and Costs Estimates:

• War Remnants Museum (2 hours, $1.5)
• Notre-Dame Cathedral Basilica and Saigon Central Post Office (1 hour, free)
• Cai Rang Floating Market (1.5 hours, $10-20 depending on purchases)
• Bang Lang Stork Sanctuary (2 hours, $1.5)
• Japanese Covered Bridge (30 minutes, $5 admission fee)
• Ferry ride along Thu Bon River (45 minutes, $1)
• Central Market (1 hour, souvenirs start from $1)
• An Bang Beach (2 hours, free)
• Imperial City (2 hours, $10)
• Tu Duc Tomb (1 hour, $6) 
• Hue cuisine for dinner (1.5 hours, $15-20)
• Halong Bay Luxury cruise (6 hours, $200-300)
• Ho Chi Minh Mausoleum (30 minutes, free)
• Temple of Literature (1 hour, $2)
• Hoan Kiem Lake (2 hours, free)
• Total Estimated Costs: $277.5 - $336.5 per person

Useful tips:

For a more relaxing pace, consider spending an extra day in each location. For a more adventurous trip, try adding a day trip to Sapa for a homestay experience with the ethnic minority group or enjoy the beaches and seafood in Nha Trang. For those who have less time, consider a 4-day itinerary that covers Ho Chi Minh City, Hanoi and Halong Bay.