No, they didn't offer that tour on our cruise. I can tell you that the snorkeling was great there. We did a catamaran sail/snorkel. It took us about 30 minutes to get to the cat which enabled us to see some of the island, then departed for about a 4 hour excursion. It was great, but didn't give us enough time to do anything else. It's one port I'd really love to revisit.
We booked through the ship, Costa Mediterranea. I look at home tonight and see if I can find the ship's name. The lady that owned it was Linda and she was trying to sell the ship for $800K. It was a really nice sailing vessel, but not worth that. I'll see what I can find.