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Photo: Henkkapet, CC BY-SA 4.0 via Wikimedia Commons
The Sailor’s Home Museum is on the idyllic island of Pikisaari near downtown Oulu. The museum is in the oldest surviving wooden building in Oulu, also known as Matila House, and is the former home of sailor Isak Matilainen.
© OpenStreetMap contributors
A "water park" meaning a floated obstacle course in the Oulu river delta. Right next to the Oulu castle ruins and cafe, so you can get a coffee or a cold beer after!
Oulun Kaupunginteatteri
Plays in Finnish.
Raatin uimahalli
Public pool and gym. Renovated in 2010. The closest public pool to downtown. Pools include children's pool, teaching pool, two 25 meter pools and a cold-water pool.
Oulun linna
The castle was damaged by attack in the 18th century and finally blown to pieces in 1793 when lightning struck the gunpowder magazine. What you see now is the maritime observatory built on the ruins; it's set in a pleasant park, and you can climb the tower for views. There's a café (Tähtitornin kahvila) within. The cellar (same hours) displays info on the castle - mostly in Finnish, but there's more in the Northern Ostrobothnia Museum.
SUP
The Oulu River delta offers an exceptionally good frame for stand-up paddling and kayaking, so why not try it out? The boards/kayaks are easily rented in either Kiikeli or Nallikari, although the former one has better selection. Use the internet reserving system (http://www.lappis.fi/index.php/sup-varaus-online/) or call the renting company to assure that there are boards available for you.
OSYK
The Finnish Co-educational Lycée of Oulu was established and opened in 1902 as a private Finnish-language lycée. It was the first co-educational upper secondary school in Oulu, a progressive learning institution at the time since both boys and girls studied in the same school. The students of today keep up the progressive spirit in the school with a wide distribution of information on gender and sexual neutrality and diversity. The school is said to have the best team spirit in Oulu. Nowadays the school also is one of the most appreciated upper secondary school in the city and it emphasizes wide-scale art education. As pretty as it is from the inside, not entering the building without a reason is appreciated since it is reserved for students doing their schoolwork. You can admire the building from the outside. The school building was finished in 1908, and the Jugend style building is a rare find in town. As well as many other buildings in Oulu, the school is said to be haunted. There is also a quarter of pretty wooden buildings and a big park with a children's traffic playground near the school.