The 3 main cities of Vietnam is the capital Hanoi, the biggest city Ho Chi Minh City and the (maybe) cleanest city in Vietnam Danang.
Vietnam has everything you need on a perfect holiday. Depending on which cities and what part of the country you want to visit, and what time of year you want to travel.
Northern Vietnam have 4 seasons and the south have only 2 seasons.
Read more about the mani cities of Vietnam here: