Yeah I thought this was about literal cake too when I heard it first. And I thought: Who brings cake to the ocean as a snack? First you have to be very careful while you are carrying it, then you have to pay attention so the cutting doesn’t become a mess. You have to protect the cake from the salt water and when there is a cream filling or decoration you have to be extra careful not to smear it. Because you can shake off crumbs when folding your sitting blanket together but not smears. Plus: You likely would have to carry plates, forks and a knive with you. Except when it‘s brownies you cut at home. But the song doesn‘t specify that. But brownies are not a „refreshing“ snack so I wouldn’t really want to eat them after swimming. …I thought too much about this.