My vision of the perfect beach has changed since motherhood. Gone is a Maldivian reverie of deserted white sand, glamorous bikinis, searing heat and reef diving. My idyll now comprises toilets, sandcastle-suitable sand, good coffee and rock pools. Rock pools are Cornish beaches USP. We have fantastic tidal reach here which means surreal temporary worlds are created and revealed twice a day. Rock pools are a fascinating, undaunting way for children to engage with the sea.