I had a wonderful camping at Campsite Montta-active camping in Muhos (Oulu), located in a wood and on a river/stream. This camp site with sloping grounds has pitches pitches with shade. Campsite Montta-active camping is located close to a pebble beach. It is possible to rent hikers' cabins. and if you like.. go fishing crabs!
For a bit off the beaten path from Oulu, go to Hautajärvi Nature Center and hiking the 80 kilometer (50 mile) Karhunkierros Trail. If you can say the name of that trail, you deserve a trip to Finland. It means “The Bear’s Trail.” The path starts at a place called Hautajärvi, which means “Grave Lake.” With such cheerful names, I wondered if it was smart hiking this trail alone. The Karhunkierros Trail features ravines, primeval forests, and suspension bridges over whitewater rivers. The civilized Finns have built pitkospuu (narrow wooden paths) to preserve the vulnerable vegetation and to make you an easy target for the gangs of mosquitoes.