Sail on luxurious Seven Seas Mariner on a North Sea Odyssey. Celebrate the summer sun as you glide along the Baltic Sea, admiring modern cities and charming medieval old towns. Enjoy overnights in Antwerp, Warnemunde (for Berlin) and Stockholm. Regent Seven Seas Cruises® offers FREE UNLIMITED SHORE EXCURSIONS, which allows you to experience the history, culture and cuisine of the exciting ports of call in the Mediterranean with knowledgeable local guides and comfortable transportation.