For the final lunch meal before going to the airport, we visited the lovely area of Santa Eulalia and a multi-cuisine al fresco place called Caos. It has very good Google reviews (4.7) and seemed as good a choice as any. Despite others ordering pizza for the 5 meal that trip, I opted for the local version of bouillabaisse.
It was served with some sliced bread rather than the crisp coutons with rouille, but the flavour of the dish was lovely and strong with the garlic seafood broth coming through. One large prawn nestled on top - I could easily have done with a few more, but sadly not.
As with all other places eaten in Ibiza, I would eat there again but wouldn't go out of my way to get there again.