A very enjoyable sidetrip would be the train from Oslo to Bergen, on Norway's west coast. It's a beautiful trip and Bergen, although small, is a nice city to spend a day walking around. I'm sure you'll find some Bergen hotel recommendations in the archives.

I don't know if you're thinking of going to Helsinki, but it's also a wonderful walking city. Also, if you have the time, you can take a 3/4 day boat excursion from Helsinki to St. Petersburg, a fabulous place.

Have a great trip, Al Sonoma, CA, USA