Kharon
Contributor
As far as the people who set the whale shark rules are concerned, Skin Diver, Free Diver, and Apnea certified is not the same as a scuba certificate. In Cancun / Isla etc a scuba certification still means you will wear a life jacket. To earn the right to wear a wetsuit instead of the life jacket, you must have one of the above before you arrive.
All My guests are scuba certified divers and some since it was invented, but they all had to get a snorkel/freediver/skindiver certification (NAUI has one)
Image how insulted they were when I told them!
The rest of the world might have a different definition, but this is how is it down there.
Just to be perfectly clear - is there no certification that would allow you to stay on the surface (no diving) but wear an inflatable snorkel vest. I have the SDI Solo card and would consider getting another cert if I could wear a minimal vest. Wearing a PFD is a deal breaker for me - the drag involved just isn't worth it.