what is the secret to happiness?

Simply traveling/tourism and living in a country for a period of more than three or four months are different things.

Yes, yes, of course, "don't confuse tourism with emigration," but for a rough estimate of "like/dislike," a month is enough. If, of course, you look not only at the sights but also at the lives of ordinary people (ideally, make good local friends who can explain the nuances).