I loved Copenhagen so much! The Danish are wonderful people: happy, friendly, active, modern, fashionable. Not to mention gorgeous. And also very environmentally concerned/aware. Everyone walks/bikes everywhere. The architecture is cool - sparse/simple but ever so lovely to look at.
Maybe if you can, fly into Amsterdam and spend a couple/few days there. It's incredible. I've been there 3x and it's probably in my top 3 places I've ever visited. The Van Gogh museum is a real treat. Amsterdam is very charming, old-world architecture, houses along the canals. All the architecture was built up, up, up - instead of wide, bc taxes were charged by the width of a house, not height. The most lovely people I've encountered, by far, are the Dutch. So gracious, polite, friendly, and helpful. It seems like the majority speak English, and don't hesitate to do so for you (unlike some other countries, where they might sniff a little at this, lol).
I haven't been to Norway, Sweden, or Finland.
Oh wait, am I forgetting you went on that big trip w/ your Mom? If yes, then I think you already have been to Amsterdam...if so, then nevermind all the Amster stuff
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