Went on the Seahorse snorkel this past Oct. No seahorses just snorkeling off the back of a boat. A nice excursion for beginning snorkelers and children over about 7 or 8. I would not recommend this excursion if you have done a lot of snorkeling as the marine life was just OK (much better in Cozumel IMO)
If you have more questions...just ask!
Jennifer