I took an overnight ferry to Finland in a premium cabin for $333. I'd do this trip again, but ideally on a nicer ship.

• My husband and I traveled from Stockholm to Helsinki on the Viking Cinderella overnight ferry.
• We paid about $239 to upgrade to a seaside premium cabin, which had a bed, couch, and window. 
• The trip went by quickly and I'd take it again. Next time, I'd look for a more modern ship. 

To visit Finland — named the happiest country for many years in a row — my husband and I traveled by ferry.

We boarded the Viking Cinderella in Stockholm, which departed at 4:30 p.m. and arrived in Helsinki at 10 a.m. the next day.