mystery tour vs stroll

mystery tour

noun
  • A short-duration outing by coach to a destination that is not revealed in advance 

stroll

noun
  • A wandering on foot; an idle and leisurely walk; a ramble. 

verb
  • To walk the streets as a prostitute. 

  • To wander on foot; to ramble idly or leisurely; to rove. 

  • To go somewhere with ease. 

  • To do, obtain, or achieve something in a casual and effortless way. 

How often have the words mystery tour and stroll occurred in a corpus of books? (source: Google Ngram Viewer )