My wife and I returned from a cruise in the Baltic about 2 weeks ago. It was a 10-day cruise on the Eurodam, the latest addition of the Holland America Line.
The cruise took us to Kiel in Germany, Tallinn in Estonia, St. Petersburg in Russia, Helsinki in Finland, Stockholm in Sweden and Copenhagen in Denmark.
During the cruise, I conducted a few sessions of LY on board. LY is a method of using laughter to exercise and it can be enjoyed by all.
During one of the sessions, a passer-by just joined in the fun and he enjoyed it so much he came for each session after that and also brought his wife along. Give it a try if you get a chance - there is probably a Laughter Club near you.