Whenever we visited Felixstowe when I was a kid, my dad would always say "We'll walk up to far end of the seafront, as there's a bit more sand (among all the pebbles) on the beach there, for you to build sandcastles". I could never really see a lot of difference but, if my dad said it was true, I supposed it had to be.
Even as I grew into adulthood, and walked along Felixstowe seafront, I always looked out for some rare sandy patches among the pebbles at the far end of the beach. It took me 50 years to work out that the real reason my father always wanted to walk to the far end of the beach had nothing to do with the availability of sand; it was simply to get me as far away as possible from all of the fairground rides, amusement arcades and ice cream parlours that he couldn't afford to take me into ;-)