hi from a little place called Hommersåk about 40km from Stavanger.
If you are only here for a weekend then I would go to Oslo. Its the only place you would recognise as an actual city.
But if you want scenary then pretty much anywhere is great – Bergen and Stavanger are very nice and have some excellent one day trips available.
Very unlikely to see any northern lights. wrong time of the year. Its too light and you really need to go up north to Trømso.
and the cost is a pain in the ar5e for visitors ut just be careful where you eat and drink and you’ll be fine.