We are a couple of seniors interested in traveling through a few Scandinavian cities (Copenhagen, Oslo, St. Petersburg, etc.) to get an overview of this region. We considered a cruise but felt that would limit the time available in many of these cities. My questions:
* Is this travel possible by train or ferry?
* Any suggested websites or books available for planning such a trip?
* Is mid-September's weather still comfortable?
* Any must see cities/points of interest not to be missed?
I thank you in advance for any assistance you can provide.