@Pong, yes I have to Vietnam several times, and indeed I couldn't resist to test if the salt wall sauna was indeed salt, and in a moment when I was alone, licked the salt wall.

@OP, sorry to hear about your troubles getting Blued. A friend from Germany reports similar. I set up my Blued in Thailand many years ago, don't remember details. Thanks for general information on how Vietnamese boys tick, that will be valuable when I go.

I did not consider Tet, for me to avoid all other festivals. Tet is 22jan2023, no problem for me as I plan to stay first two weeks of Jan.