Where else to start but the beach? Pembrokeshire has some magnificent unspoilt ones. Marloes Sands runs for a mile, with breakers for bodyboarders and Runwayskiln Cafe for coffee (and food, if the belly is rumbling). For total seclusion, scramble to Albion Sands next door or head up the coast to rocky St Brides Haven. There is plenty of choice here, and almost every option is a winner.