Tet in Vietnam is the most special event.
It's very great if you travel to HCMC or any other provinces of Vietnam to see the celebrated streets
But Vietnamese tend to come back hometown to gather with family, so the city would be not many people.
Do you have any plan for new year or Tet holidays ?
As a person who has lived for 20 years in HCMC, Vietnam, I can suggest some information for you to have a memorable holidays in Vietnam