In this episode, Dougie takes a walk along the John o' Groats Trail. He meets the man who created the route and discovers how it was inspired by the Appalachian Trail in Virginia. Dougie explores the stunning Caithness coast, discovering some of the hidden historic sites along the way, including the Whaligoe Steps.Meanwhile, Rosie is further south in Easter Ross, where she investigates how drones are being used to calculate how much carbon is locked away on Scottish farmland.Elsewhere, Arlene is testing the responses of the Galloway Mountain Rescue team in a fast-water rescue scenario. And we catch up with the work of our two rural vets as springtime brings new life to Scotland's farms.