Wildlife has the right of way on the Isle of Arran, off the western coast of Scotland. Set off on a kayaking excursion to spot seals or plant one of the world’s rarest trees in a woodland revival.

Given its plethora of landscapes, it’s easy to see why Arran, the largest island in the Firth of Clyde, is regarded as a sort of Scotland in miniature. From fog-wreathed peaks to scenic coastal paths, ...