We booked this trip through a web site called shoretrips.com. Finding the operator at the port was a bit of a problem and took inquiring of about six people before we were steered to the proper people.
The excursion was called Sea Turtle Snorkel Plus Lunch.
We were escorted to the snorkel sites by Catamaran and the trip itself was well worth the expense. The crew was wonderful and the beverages, including beer and rum punch was included. The crew would even stop and as you if you wanted a refill when they noticed that your cup was empty.
The first stop was at a site that had plenty of sea turtles that would come right up to you and let you touch them. What a great experience.
The second stop was at a shipwreck site. The one wreck that I went to was clearly visible and I was able to take plenty of photos. One of the snorkelers ever dove down and swam through the wreck.