Day Cruise to Stockholm from Helsinki by Silja Line. (M/S SIlja Serenade). Silja Serenade is one of the biggest car ferries in the world. The ferry was built in 1990 and it had a big recunstruction of interior parts in 2006.
Silja LIne uses Värtan harbour in Stockholm.
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Day Cruise to Stockholm (same route but different company/ferry) by Viking Line a mounth earlier: http://www.youtube.com/watch?v=uxe3rtluUxg&list=UUpN0kBXbTF568rIkGnGuh8g&index=14&feature=plcp
