There are various Shetland walking guides available, including what I’ve always considered The One Guide To Rule Them All, written by Peter Guy - Squadron Leader Peter Guy, - former RAF Saxa Vord Commanding Officer and once communications chief for BP at the Sullom Voe Oil Terminal.
Walking The Coastline of Shetland comes in seven volumes, and was a real labour of love and worn footwear for Peter. It is invaluable in many ways: it’s extremely readable, has great photographs by the author, brilliant historical insights and is, due to its multi-volume publications, incredibly detailed. Because Peter lived here for decades and was a real lover of Shetland in all its aspects, there is a passion and intimacy about each book - particularly the walks on his ‘home ground' of Unst and Yell. The books offer short and day-long walks as well as the ultimate round-Shetland route.
But, and it’s a major but, they’re out of print and have become both collectable and expensive second hand.
The best place to start if you’re interested in walking in Shetland - either major treks or minor jaunts - is our own shetland.org website. Go to https://www.shetland.org/things/outdoor/walking for an introduction to what you’ll need, where to go, the fantastic Core Paths project from Shetland Islands Council, the strange business of bagging Marilyns, and a handy ‘Find a Walk’ search feature..