I am planning a trip this summer to Copenhagen and Stockholm but am contemplating adding in Oslo in the middle. I will be gone for 9 days and was originally planning on splitting those up between Copenhagen and Stockholm, but now I am interested to see if I could add 3 days in Oslo. I will be flying into Copenhagen and out of Stockholm. A possible itinerary will look like this:
May 23rd - Fly into Copenhagen
May 26th - Copenhagen --> Oslo (by plane)
May 29th - Oslo --> Stockholm (by train)
June 1st - Fly out of Stockholm back to Chicago
Is this too ambitious? Should I just stick to Copenhagen and Stockholm and do a few day trips?