We did Viking Homelands in 2016 and chose the included Rostock tour which was visiting a brewery for pretzels and beer, then into town for a city tour and back to the ship by ferry. It was a very nice day with perfect weather. We decided not to go to Berlin since it was supposed to be by bus. At the last minute they changed to a train. Had we known the change we might have gone to Berlin. We did however enjoy the day in Rostock, the brewery, the ferry ride and having free time to walk around Warnemunde. The Berlin trip takes up the entire day.