My first cruise was to the Western Caribbean as well and I loved it! Sting Ray City at Grand Cayman was one of the highlights of the trip. I enjoyed the tour of the turtle farm too.
In Ocho Rios, we opted to be on our own and go into town and do some shopping. In hindsight, I would have opted for another snorkel excursion of some type. I fell in love with snorkeling and with cruising on this trip!
I felt very uneasy the entire time I was shopping in Ocho Rios. It seemed the sales people in the stores were too pushy. Many would grab your hand and try to lead you to look at merchandise and seemed to say "Lady, Lady, Lady, Look Lady". In one store, I guess they overheard my name and then it was "Debbie, Debbie, Debbie, Look Debbie".
My advise for a fun-filled cruise is to get involved in all the on-board activities. Let your hair down, don't be shy and get involved and you will really have a blast.