okay so it really depends where in norway u are, but u are most likely near some really pretty nature so i highly recommend you go hiking.
it is very expensive here, especially in big cities, so if ur on a budget i'd keep that in mind and not go out to eat that often. (not many good restaurants here anyways)
u should try the brown cheese, and our chocolate. the chocolate is up there with swiss and belgian chocolate, the Freia brand is reallyyyy good. Kvikk lunsj also (better version of kitkat). as for dinner, komle is the best norwegian dinner, but it might be difficult to find in restaurants (worth it to try atleast).
as for gyms, i dont go to a gym to work out, i just go for runs or do bodyweight exercises in my basement, so i dont really know. ive heard Sats is a good gym, but idk how expensive it is.