I've been taking dance lessons since the beginning of this year, in ballroom dances like waltz, foxtrot and tango, and also humppa and jenkka which may be less known outside Finland, as well as some samba too. I don't know but I guess that the usual Finnish variations of them are more casual than what foreigners might first think about.
Dancing was very important for my parents' generation, and many of them have first met in open-air dance pavillions that once existed in every village. This culture was suffering in the past decades, but now my feeling is that it is coming back again. Nowadays there are more and more young people joining the scene, including me (Hey, I'm still young. Really!). It's fun and it offers a nice way of spending the weekend nights socially, meeting people you might not otherwise have met.