When you go to a beach you want to have fun. Splash everywhere and everyone! Enjoy your time.
Perhaps you'll lie on the sand exhausted. Let your mind wander into science for a short while.
How many grains of sand on your still-wet fingers? How many atoms in a grain of sand?
“I’ve heard that there are more stars in our Universe than there are grains of sand on all the beaches on Earth. Is this possible?” Awesome question!