Arctic to Atlantic – Northern Lights & Viking Trails

A 48-night round trip from Helsinki, sailing on the evening of 13 May. It makes 42 port calls, starting with Tallinn, Stockholm and Visby. The stops are in 13 countries, and calls last 7 to 16 hours. Typical highs for the time of year run from 6°C in Isafjordur to 21°C in Riga (43 to 70°F). You're back in Helsinki on the morning of 30 June. Caribbean Princess (2004) carries up to 3,140 guests on 18 decks and has 13 restaurants, 7 of them included in the fare.