1
general::
An unusual route or destination, as in We found a great vacation spot, off the beaten track. This term alludes to a well-worn path trodden down by many feet and was first recorded in 1860, although the phrase beaten track was recorded in 1638 in reference to the usual, unoriginal way of doing something.
American Heritage Idioms
2
general::
Phrase(s): *off the beaten track [and] *off the beaten path
Fig. away from the frequently traveled routes. (*Typically: be ~; go ~; travel ~.) • We found a nice little Italian restaurant off the beaten track.
McGrawhill's American Idioms And Phrasal Verbs