Derek's final instalment has a very personal connection to his contributors who have overcome injury and disability to get out and about. He starts in Pembrokeshire, in the quiet fishing village of Porthgain to meet local seaman Captain Brian Thomas, who spent weeks in a coma after collapsing when out walking. They also explore the area's industrial past and soak in the stunning sea views. Finally it's right to the top of Wales, to RSPB Conwy to meet Nicola Cockburn, who's been blind since birth, and find out what's involved when she goes out walking. Derek also hears more about how her passion for birdwatching helps her get the most from going for a walk.

Week three and it's a weather presenter's day out, as Derek's first walk sees him shown around beautiful Three Cliffs Bay in Gower by his weather team colleague Behnaz Akhgar. She tells him about her life in Iran before moving to Wales and why Three Cliffs Bay is her favourite place in the world. Next it's Powys and to the market town of Welshpool. Derek uncovers some of its hidden history before taking a stroll through the Powis estate deer park, and marvelling at Powis Castle with its bizarre yew hedges. It's then a waterside walk along the Montgomery canal and back to town.

Derek tackles two of our well-loved mountain ranges - the Black Mountains in the Brecon Beacons and the Glyders in Snowdonia. Starting in the small village of Bwlch, his walk explores the history of the Rhiangoll Valley and the village of Cwmdu, before hitting the hills to follow the Beacons Way, up and over and back to Bwlch. His next challenge is to climb one of Wales' super-mountains - Glyder Fawr at over 3200ft! It's tough going, with scrambling and thick fog - will he get to the top?

Derek explores two popular Welsh tourist sites, before setting off to discover their more secret side. His first walk begins at Porthmadog harbour, before crossing the cob and arriving at the Italianate village of Portmeirion, and discovering 'Y Gwyllt' the wild headland beyond. It's then time for a treasure hunt, as he visits the Roman gold mines at Dolaucothi, before breaking out into some beautiful countryside to take up their trig point challenge, and reach the highest point on the estate.