Head up to the roof of Chalk Farm's lovely Roundhouse and claim your spot on Camden Beach, an impressively big and often gloriously sunny pop-up sandpit. Relax in a deck chair with a rum cocktail, play a little ping pong, grab some food from the barbecue or build a magnificent sandcastle. Entry is free but it does get busy so make sure to arrive early to secure your portion of the 150 tonnes of sand that are up there. If you're feeling extravagant or worried about personal space you might like to book one of the private beach huts. Families are welcome, as are buckets and spades.
Find more great urban beaches in London