jaunt vs mystery tour

jaunt

noun
  • A short excursion for pleasure or refreshment; a ramble; a short journey. 

verb
  • To ride on a jaunting car. 

  • To ramble here and there; to stroll; to make an excursion. 

mystery tour

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

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