This review gives a brief overview of when it is best to take the tour offered by the cruise line or go on your own.
Copenhagen: We arrived a couple of days early and enjoyed Copenhagen. I recommend the combined Hop-on Hop-off bus and canal boat ride. You can see a lot of Copenhagen with this tour.
Oslo: The ship docks a short distance from the main square. It's very easy to walk around town.
Arhus: Similar to Oslo, the ship is close to the main area of town, including the art museum with the coloured panoramic view. The City Bus (#18) takes you to the Viking Museum.
Warnemunde: If you have not been to Berlin, you should do the ship's tour. It's a long day and 3 hours each way on the train. You only get a taste of Berlin, but there is a lot of significance in the trip.
Tallin: Take the shuttle bus into town and you can easily do the rest on your own, including the upper town with the beautiful cathedral.
St. Petersburg: We did the ships tour and we were very pleased. There are a number of other local tours that are frequented. Unless you have been to Russia before, I would suggest that you do not do this city on your own. Also, everything is transacted in roubles. Be ready for exchange issues. Passport control also adds time. Don't be late returning to the ship because the ship will leave on time. The harbour channel is narrow and is managed similar to a busy airport. One ship was late and was delayed by 24 hours.
Helsinki: Easy to do the town on your own unless you want to visit a specific site outside town. The shuttle bus helps.
Stockholm: Small town, but many islands so you need help getting around. The ship's tour is ok. You may want to arrange a local tour because the shore stop is short.
Great passages: The ship has to traverse some nice passageways. Take a seat in the Horizon Cafe after leaving Oslo, St. Petersburg and Stockholm to view the local scenery.
On Ship: John Lawrence is an excellent on-ship commentator. He is a wonderful story teller. Don't miss his talks. He often sets up outside the library. Spend a minute or two with him. He is very interesting.
Calypso Cove: There are some good bargains here if you are selective.
Casino: So-so. Serious poker players need not bother. Craps is better for the fun.
Transfer to CPH airport: The cost is about the same as a cab, but they handle all the luggage. It's worth it.