Cycling sisters Kerry and Kirsty MacPhee from South Uist take to social media to find out the nation's favourite cycle routes. In this episode, they are just north of Tyndrum at Loch Lyon with hill-walker Colin MacLeod, whose bike is a means to an end for reaching more summits. Starting their route at the foot of Beinn Dorain, Colin has a slalom of rivers crossings lined up for the girls and they battle across fjords flowing down from the surrounding hills. Unfortunately for Colin and Kirsty, they don't manage to stay dry - and Kerry isn't sympathetic for their wet feet. They pass over the West Highland Way, which attracts walkers all year round, before then also passing under the West Highland Railway Line. Colin and the girls then stop at the fank where famed Gaelic poet Duncan bàn MacIntyre once lived and worked.