Sandy-beach bay
A Sheltered mile long beach, only used by two caravan/camp sites so never gets crowded. Plenty of small coves and two seaweed-covered islands to explore below high tide.
Lake Vyrnwy
Man made reservoir (Though you would not think it)owned by Severn Trent Water, set at the base of the Snowdonia national park. Fantastic place for beginners to go and reasonably quiet.