As I know, on Sunday are closed. Try to take a look on visitoslo site

I just visited in January. The shops are open all year round , but they do close relatively early during this time of year. The sun is setting around 4:30 p.m. right now. All the restaurants in the area were open. Many even had outdoor seating even in January. They have heaters. It's a wonderful place to visit.

Avoiding the big cities will save you a little fortune as long as you keep away beverages containing alcohol. All in all Norway is more expensive than GB, but well worth a visit.

Akke Brigge is the area. So yes it's open on weekends :) You should be able to access the area around the sea (pier, boats, little dammed off water area). The shops definitely on Saturday. It will be busy with the hustle bustle of city life. Restaurants and bars might have different timings on a Sunday. The castle museum should be open on Saturdays.

I agree with NikonGlass. It's an easy walk or you can take the tram. Buy tickets for the tram from the kiosk at the station.

Around 10 mins driving

HI I don`t know the name of your hotel?? Thanks