Recommend tourist routes to Vietnam

First fly from China to Ho Chi Minh City, then the route is: Saigon (Ho Chi Minh)-Yazhuang-Minai-Hue-Hanoi-Sabah (or Quang Ninh), and then return home by land. Saigon, Ho Chi Minh City is a must-see city to Vietnam, equivalent to Shanghai, China; Yazhuang and Minai are both beautiful coastal cities, but the customs of the two cities are different; Hue is an ancient capital, just like Xi 'an in China; Needless to say, Hanoi, the capital of Vietnam, is actually nothing interesting. The best you can do is to look at Ho Chi Minh Mausoleum. By the way, you can't wear shorts and sleeveless slippers to Ho Chi Minh Mausoleum. Quang Ninh and Sabah are going to the border of China. Sabah is close to Yunnan, where you can feel the folk customs of the French colonial period. Guangning has "Halong Bay", which is compared to "Guilin at sea". The sea there is not endless as we usually see, but among the mountains. From Guangning, you can enter Guangxi through Mangjie to Dongxing.