"Mixed Pickles" is a well-known international swing dance club/organization based in Saarbrücken, Germany. They are famous for organizing dance workshops and trips. It is highly likely this link refers to a photo gallery from one of their organized events.
He remembered the argument they had had that day. It was about something trivial—whether they had enough water left, or if they had put enough sunscreen on. He couldn't remember the specifics, only the heat of it, and how quickly it had dissolved when they jumped into the freezing water of the bay. mixedpickles pics in the bays of sardinia 06 link
I need to give it a title, maybe something like "The Secret of the Bays" or "Mixed Pickles of Sardinia". The protagonist could be a food blogger, an archaeologist, or a descendant of a local family. The pickles could be connected to an ancient ritual or a hidden ingredient. The bays serve as the adventure location where they explore, find caves, or underwater secrets. "Mixed Pickles" is a well-known international swing dance