Planning a trip to Vietnam. Anything I should know as an American?

have friend saigon, , we're planning trip vietnam couple of weeks. luckily, i'll have him interpreter , such. first time ever visiting vietnam. there should know before go? generally, vietnamese think of americans? there things should avoid? need vaccinations before go? input appreciated.

i have friend saigon, , we're planning trip vietnam couple of weeks. luckily, i'll have him interpreter , such. first time ever visiting vietnam. there should know before go? generally, vietnamese think of americans? there...

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