Hi all! My mother and I are planning a once in a lifetime trip to visit my mothers family in Harstad, Norway either at the end of August or early September. Currently, we are trying to figure out what is the least costly and most effective way to get around Norway once we arrive in Oslo and also if we should utilize the train system or not. The trip itinerary we have come up with so far is as follows, fly from Seattle to Amsterdam or London for 3-4 nights, then fly from Amsterdam or London to Oslo and stay for 3-4 nights, then either possibly take a train, boat, or fly to Harstad for 2-3 nights? We were also possibly wanting to visit Sweden since it is somewhat close and take a train there but not sure which cities would be worth visiting.
Also, we definitely want to see some of the fjords and wondered which ones would be along our route or not too far off? Also, is Bergen or Troms worth staying in for a couple nights and maybe shorten our time in Oslo instead? If we go in September we might possibly be able to see the northern lights in northern Norway but didn't know if it would be too cold to go at that time or if August would be better overall. Thanks for any advice and feedback, it would help us out a lot.