The street life is fascinating, with the usual contingent of street musicians and other entertainers. Discount admission to most museums. Discounts at some restaurants. Among other advantages. I considered it worth the expense.
Restaurants seem to be rather rare around Oslo.
I like eating out, and I had a rather hard time finding restaurants around town. Alcohol is strictly controlled. Drunk driving laws are strictly enforced with heavy penalties, and foreigners cannot claim ignorance as an excuse. Oslo seems to be a safe place. I never felt in danger of physical harm at any time.