Well, current thinking is HoHo and the Blue Grotto. The first definitely goes on a Sunday (although shorter hours), and I think the grotto is open but the site is not clear either way. My girls aren't into dead rocks or churches, but the boat trip swings the grotto, so this is a bit of a compromise agenda. Haven't got that far with detailed planning yet as it is late into the cruise - I'm still finalising Barcelona, lol!
Celestine
What is HoHo?