If you grow up on the West Somerset coast, Wales is the mystical, distant shore across the water. But crossing the bridge into Carmarthenshire reveals a warm, vibrant world of generous hospitality, spectacular landscapes, and fiercely independent local food. Join travel writer Martin Hesp as he explores the architectural marvel of the National Botanic Garden of Wales, walks the newly opened 13-mile Tywi Valley Path, wanders the wild headland of Llansteffan Castle, and meets t