What should I pay attention to when traveling to Halong Bay in Vietnam?

You said that you had gone through the exit formalities later, but you asked what procedures you had gone through earlier. I feel dizzy. . . .

The exit procedure is to bring a Vietnamese visa passport.

The exchange rate is 1 RMB: 2,500 Vietnamese dong.

It rains occasionally in Halong Bay, Vietnam from March to April. The temperature is around 20-25 degrees Celsius in March and even higher in April.

Law and order is not bad. Of course, petty theft always happens. Take care of your valuables.

Also, tipping Vietnamese waiters is a habit in all countries except China. Tips can be given as appropriate, generally between 10000-20000 VND.