Porth Oer, Llyn Peninsula
Llyn Idwal, Bangor LL57 3LZ, UK
As it's part of a National Trust estate, there’s a car park and café on the hill above the beach. Swim out towards the Irish Sea and keep your eyes peeled for seals, puffins and porpoises. One of several swimming coves, the Llyn Peninsula is a great place for a multi-stop swim safari.