Julia Bradbury walks the Wicklow Way, Ireland's first official countryside path, while Matt Baker journeys along the River Thames on the Oxfordshire/Berkshire border, learning about the people who live, work and play on Britain's most historic river. John Craven travels to Devon to investigate the demise of the stag known as the Emperor of Exmoor, and to find out why it's considered necessary to control the deer population. On his farm in The Cotswolds, Adam Henson welcomes a new rare breed of native Irish cattle.