Well, shouldn't really call this orienteering, because I ran without a map, but I decided to go out and try to follow Johan's
reflexbana. The course is marked by a line of reflective silver tags nailed to trees along the length of the ~5k course, visible if you shine your headlamp on them. Of course, some have fallen down and some just get obscured by the growth of new stuff, but it makes for a fun way to go running in the woods.
Without a map to follow along, I was stopping occasionally and looking around wildly trying to find the next marker, sometimes it would take a couple of abortive forays in various directions to find the trail of breadcrumbs again.
Fun! Also, this was my first New Year's Eve in Sweden, and there were a tonne of fireworks going off. The whole week really. Small ones being shot around in residential areas and in any small open field.