Some places are over-rated
The tourist industry is a major contribution to the Vietnam's economy. Vietnam is a tourist destination that promotes itself far too brilliantly. So much so that, in many cases, you will only discover that they are overvalued after you have spent your money and time on them. Every country, and Vietnam is no exception, has a list of places that are over-hyped. Of course, it differs from one person to the next.
Halong Bay is one of Vietnam's most popular tourist destinations, and many people believe it is overcrowded and overdone. It is certainly lovely, but when locals sell it, there is some hyperbole.
Trips to the Mekong Delta in the south near Ho Chi Minh City, as well as several sights in cities like Mui Ne, Danang, and Phong Nha, are all recommended. So, take the list of attractions with a grain of salt when deciding whether or not an attraction or a city is truly worth your time and money.