Do not go where the path may lead, go instead where there is no path and leave a trail. — Ralph Waldo Emerson
trail : a course followed or to be followed — Webster
Trail is usually a path, track or unpaved lane or road. — Wikipedia
Educational trail (or sometimes educational path), nature trail or nature walk is a specially developed hiking trail or footpath that runs through the countryside, along which there are marked stations or stops next to points of natural, technological or cultural interest. These may convey information about, for example, flora and fauna, soil science, geology, mining, ecology or cultural history. Longer trails, that link more widely spaced natural phenomena or structures together, may be referred to as themed trails or paths. . — Wikipedia
Test your endurance on the world’s 10 best treks (Joe Bindloss, Lonely Planet)
23 of the world’s best hiking trails (Joe Minihane, CNN)
The 25 Best Hikes in the World Right Now (Stephanie Pearson, Outside)
The Oregon Trail is a series of educational computer games. The first game was originally developed by Don Rawitsch, Bill Heinemann, and Paul Dillenberger in 1971 and produced by the Minnesota Educational Computing Consortium (MECC) in 1974. The original game was designed to teach 8th grade school children about the realities of 19th-century pioneer life on the Oregon Trail. The player assumes the role of a wagon leader guiding a party of settlers from Independence, Missouri, to Oregon’s Willamette Valley via a covered wagon in 1848. — Wikipedia
Two roads diverged in a yellow wood,
And sorry I could not travel both
And be one traveler, long I stood
And looked down one as far as I could
To where it bent in the undergrowth;
Then took the other, as just as fair,
And having perhaps the better claim,
Because it was grassy and wanted wear;
Though as for that the passing there
Had worn them really about the same,
And both that morning equally lay
In leaves no step had trodden black.
Oh, I kept the first for another day!
Yet knowing how way leads on to way,
I doubted if I should ever come back.
I shall be telling this with a sigh
Somewhere ages and ages hence:
Two roads diverged in a wood, and I—
I took the one less traveled by,
And that has made all the difference. — Robert Frost, The Road Not Taken
Here are links to pages about closely related subjects.