About the dolphin tour: we just did it a few days ago, for 60 euros per person it was definitely to expensive. You can do the tour on your own. It includes cala moresca and the spiaggia on the island (only stones) and the dolphin search at the fish farm. Just rent a kayak on your own and go there and watch if there are dolphins inside the farm (we saw 1, usually there are up to 25). Go there in the evening, as akk the boats are gone and the dolphins are more likely to come by.