Are you looking for something fun to do in the summer with your family or friends? Do you consider yourself to be patient and concentrated? Then I would highly recommend you try mini golf if you haven’t already.
Christiania mini golf club is a club that offers two outdoor facilities with miniature golf courses in the heart of Oslo: one in Grunerløkka (Søndregate 1, 0550 Oslo) and one in Torshov (Hegermanns gate 25, 0476 Oslo). The prices are considered more than reasonable and you are even allowed to play for free if you are over 60 years old. Membership for children only costs 100kr and they can play at any time at both places.
I, myself, had tried mini golf before and the reason why I would recommend Christiania mini golf club is that, although their courses are not that fancy, their facilities are very easily accessible and are never too crowded. There are also other free things to do in the area around the courses like volleyball and gym equipment in the park or just a walk around in the summer weather afterward.