The educational trail is a policy to use for lessons.
Oh really? Do they convey information about, for example, flora and fauna, soil science, geology, mining, ecology or cultural history.. which is cool
That is correct. The intent is an appreciation for life sciences.
Educational trails with a strong thematic content may also be called "theme paths", "theme trails" or "theme routes", or may be specially named after their subject matter, for example the Welsh Mountain Zoo Trail, Anglezarke Woodland Trail, Cheshire Lines Railway Path and many more!
A very nice trail is visit your local wildlife preserve. You can spot various species of plants and animals.
Forsure!  Longer trails, that link more widely spaced natural phenomena or structures together, may be referred to as themed trails or paths!