We had walked more than a mile, gently uphill all the way, and looked at the next hillock with hope and exhaustion. Our anticipation grew as the clouds cleared and large patches of sunshine lit up the moors. Finally we were at the top of a cliff that gradually sloped down to the edge. Most of Unst is fringed by a rough, serrated coastline, massive sea cliffs and rocky headlands, and below us we could see the foaming, churning waters of the ocean. Ahead lay the rock, Muckle Flugga, with the lighthouse built by Robert Louis Stevenson's grandfather, set in a brilliantly sunlit sea that challenged a painters palette. Shades of blue from royal to aquamarine, constantly changing colour with the play of light and shadow and the heavy swell of the sea. A few clouds added contrast and drama to the hues of sea and sky. It was nothing short of spectacular.