plain sailing vs pleasure cruise

plain sailing

noun

  • Something that is simple, straightforward, or easy; something that offers no troubles or difficulties. 

  • The navigation of waters free from hazards or unfavourable winds. 

adj

  • simple, straightforward, or easy 

pleasure cruise

noun

  • A pleasant or easy situation without any challenges. 

  • A pleasure trip, especially on a ship. 

How often have the words plain sailing and pleasure cruise occurred in a corpus of books? (source: Google Ngram Viewer )