Just returned from a 2 week Scandinavia trip from End Jan to mid Feb. We spent 2 days each in Copenhagen and Stockholm, 6 days in Tromso and 4 days in Bergen.
Extremely lucky to catch the northern lights in Tromso as it was pretty much cloudy the time we were there except for a single clear night where we joined a northern light bus chase. Other activities we did in Tromso are husky sledding and a road trip.