Fair Isle is a true gem.
Lying in the ocean between Orkneys and Shetland, it's reachable from Shetland by a little airplane (from Tingwall) or by boat (the Sea Shepard).
Plenty of wildlife, birds from all over the world - never saw puffins so close - seals, a world-known bird observatory, and above all a living community of 65 (more or less) people pride of the land and joyful to share their beautiful world. A richness for the photographers and the walkers, perhalps the best island I've seen.
Go there, stay at the South Lighthouse, or at Tommy's B&B (the Auld Haa Guest House), and for a hot cup of tea go to the Bird's Observatory. You'll come back.