First, we just sailed up the shore a ways and then came back about half way. Only Bill, myself and one other couple actually went snorkeling. I was not too thrilled about it after snorkeling in a cave last year and learning that I was in fact claustrophobic. The lady of the other couple got out right away and so it was just Bill, another guy, me, and two guides. After about 10 minutes, I finally stopped hyperventilating and became more normal. We saw tons of stuff.... fish, coral, crabs, sea urchins. So many sea urchins.
After that, we got to eat and drink. They sailed further back from where we came from and we went swimming with a floating bar. The swimming didn't last too long because the air was cool and windy.
Additionally, we had an awesome main guide. I cannot remember her name, but she was originally from Germany. She moved to the Dominican Republic to be a SCUBA instructor, but ended up doing what she's doing now because she needed some time out of the water. She's a great example of making moving to another country work.
Overall, this side trip was fantastic and I would definitely recommend it. I would even do the same trip again because the people were so great and it was a nice, relaxing day.