We went to Norway last year with 2 13 year-old boys.
We got a Stena-Line ferry from Newcastle to Bergen (I think!) and drove from there about 4 hours North to the holiday park, which has self-catering chalets, with grass on the roof! The holiday park was advertised in the ferry brochure and bookable as a package- discount for booking early if I recall correctly.Can't remember how much the package cost, but it wasn't extortionate.
The scenery certainly is dramatic- rather like Scotland only more so! The mountains are higher, the country roads are windier (i.e. more bends, not more wind!), LOTS of ferries needed to get about the place.
There was plenty to do- we visited a glacier, and the glacier museum, which has lots of hands-on exhibits about glaciers, and an IMAX-type film show. There was a train that went up a valley (name of both train and valley escape me), which was spectactular-it's apparently the steepest track in Europe (the world?)and each carriage of the train has several independent braking systems.
Halfway up the train stops at a viewing platform so the passengers can get out and look at a spectacular waterfall and you get a "surprise" visit from a mountain nymph, who appears from nowhere, then disappears again. We had a boat trip along very narrow fjord, and drove through the longest tunnel in the world (?)which has stopping places, and diferent coloured lights to keep you awake. There was a folk museum with plenty of indoor and outdoor exhibits, and well-laid out country walks.
The weather was good- some wet days, but warm, and the people very friendly, and universally English-speaking.
Down-side: eating out v.expensive, even chips and burgers, so if you go S/C I'd recommend packed lunches. Many roads have tolls, so you have to allow for this(a very annoying and expensive toll booth is on the road just before the glacier centre- so if you've driven for 90 mins to get there you have to pay up- turning back isn't an option).Because of the number of fjords, there are hundreds of ferries, which are often not shown on the map, so you have to allow plenty of time for a journey.
We loved our holiday, and would go back there, but perhaps to a different area, as we'd "done" all the attractions in our area by the end of 10 days.