Thank you guys for sharing your points of view.
100% agree on visiting a doctor and getting all the vaccinations & co.
About going around the place there, for what I understood so far, my initial idea of staying well closed into the hotel looks still the wisest, after all is just for one month.
Maybe just some very quick excursion to get some local beer to bring in the room will be reasonable, in group and during day, but that's pretty much it.
I know that this will mean missing a valuable experience but it looks like there are still too many wrong places and wrong moments around... better not to risk to find yourself in one of those, if you don't really need.
I'm really appreciating everything you're writing even if I cannot agree on everything, so thank you once again for your advice!