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All of the excursions you mentioned are great! I've done all but the dolphins, but I have read great things about that too. For Costa Maya, we went to the Chacchoben Ruins. It was a great tour, in my opinion. If you havent been to any other ruin sites, this is a good thing to do in this port. Another thing, for the stingrays and the cave tubing, take independent tours. They are much less crowded, less money and a better overall experience. There are several reputable tour companies for both. Enjoy your cruise!!