After returning to Sheffield, Morrison became a prominent member of the Climbers' Club (CC), Peak Climbing Club and Castle Mountaineering Club. Among his numerous first ascents on Peak District edges were Blenheim, Beaufort (Gardom's Edge), High Heaven (Yarncliffe) S.A.E, Nova, Red Wall Lawrencefield Quarry, Don's Mantle, Morrison's Redoubt (Stanage Edge) and Robert. He worked alongside CC colleagues Eric Byne, Pete Marks and Paul Nunn on the first Peak District climbing guides. Actively involved with the development of outdoor education in the Peak District, he was an Assessor for the Duke of Edinburgh's Award and an instructor for the Outward Bound programs at White Hall. Morrison also ran a mountain sports business and became the sponsor of the annual fell race held in Derbyshire now known as the Don Morrison Memorial Edale Skyline Race.