For us it is easy; DW is a swimmer while I am not. She swims, I watch our stuff.
Actually, on our very first port on our very first cruise, I do not remember the port name, but we went to Nice. (You could also go to Cannes or Monaco.) After visiting museums, she went for a swim in the Mediterranean. She plopped our stuff down near some topless French (at least I assume they were French) women. I admit to having been distracted! 😊
And if this makes me a dirty old man, what can I say. I am an American. 🤣