Derek Brockway is in Dinas Powys, just outside Cardiff, to walk the five-mile Salmon Leaps circular trail. The route takes him through ancient woodland and across the historical Cwrt yr Ala estate before he returns to Dinas Powys where the Village Show is in full swing. Wildlife expert Lizzie Daly goes in search of night creatures and Onkar Singh Purewal joins a dawn swim at Penarth