Street orienteering in Otaniemi-Tapiola, 9km. 20 controls. It felt really long - I was tired from the beginning and very very tired after 40 minutes.
Nice sightseeing anyway: on the way there were such pearls of Finnish modern architecture as Tapiola swimming hall, Kino Tapiola, Futuro house in the backyard of WeeGee building, Taskumatti houses etc etc...