We had hoped to SNUBA to see lots of fish on the reef, but we decided to snorkel after filling out the medical questionnaire. This was very confusing because it asked a lot of questions about your health, activities, limitations, etc., but the on-line form did not have the capability of checking Yes. There were only No's, and these were all checked in advance, so even if you had heart trouble, there was no way to check Yes and for the SNUBA people to know what your issues might be.
On our trip C.J. was the trip leader and the guide for our group. He was very professional and took his time explaining the safety aspects, how to work with the SNUBA gear, hand signals, things to do and things not to do. He was obviously very experienced, and those who did SNUBA felt comfortable with him as guide. The only difficult thing was that the SNUBA briefing was while the boat was motoring out to the dive site, so it was difficult to hear.
Unfortunately, the trip was not able to go to the reef because of high seas and wind, and that was disappointing but no fault of SNUBA. We dove and snorkeled in a protected area and were able to see sponges, coral, some interesting fish and aquatic plants. I'm sure the trip would have been spectacular if we had been able to go to the reef.
The advantage of SNUBA is that the air hose limits you to a depth of about 20' so there are no decompression issues. The limited depth is also a disadvantage, and I'm not sure that we would have seen that much more had we been able to SNUBA on the reef vs. snorkeling.