After all my years of visiting Vietnam, I've come across so many beautiful places...to list a few they include: Ha Giang Province, Pu Luong Nature Reserve, Ninh Binh Province, the Mai Chau/Moc Chau area, the Central Highlands, Phong Nha area, Cat Ba Island and Ke Bang National park. What about you? what beautiful places have you come across in Vietnam?
Nha Trang (beach resort), Phu Quoc Island (national park), Hoi An (fishing spot) and Sa Pa (rice terraces) are really beautiful places but Vietnam as a whole is stunning. Best of both in terms of natural attractions and buildings..
Vietnam is one of the most beautiful and wonderful places I've ever visited. They absolutely MUST visit is Halong Bay, which is best seen on a boat tour/cruise. You can see the limestone island rocks jutting out of the water and on a cruise tour you can visit them as many have caves and beaches on them like Cat Ba Island and Tuan Chau.
Vietnam is the beautiful country, I highlight recommend visit Sapa, Da Nang city, Phu Quoc island - the awesome places.