Once we move out of the forest, things do become more complex. There are "nature trails" that can be both well kept an maintained or little more than a muddy line through grass and brambles. In the UK, this sort of "trail" has a nuance (usually for the purpose of building up public interest and that of teachers leading groups of children, etc) of "going into the wild" - a thing that is difficult on a small overcrowded island.
Again, out of the forest, paths abound in urban parks, etc and are almost invariably metaled and some could support smaller vehicles.