From Longman Dictionary of Contemporary Englishnature trailˈnature ˌtrail noun [countable] a path through the countryside that is designed so that you can see interesting plants, animals etc along the way
Examples from the Corpus
nature trail• There is a hide and a nature trail which is always open.• Untouched for thirty years, ideal for a nature trail - the undisturbed habitat of birds and animals.• There is a one and a half mile circular nature trail around the reserve, which is definitely worth doing.• The rerouted nature trail offers three new vistas from about 150 feet above river level.• There will be no polecat with young at post number seven on the nature trail. 