[JohnnyFlake]

I have been on many, many Eastern and Western Caribbean Cruises and have done it a few different ways, in the beginning.

Advice given above:

"It depends upon whether you are planning to do something on your own in port, or if you are going with a cruise-line-provided excursion. I prefer the latter, because although a little costly, the excursion people work with the cruise line to ensure that you are back in port on time**. Also, the cruise lines make sure that the excursion vendors meet their standards."

This is excellent advise. Everything is well planned and you get to do and enjoy things without having to worry about schedules and so on! You are always well taken care of by the vendors you visit, as they what the return business from the cruise ship team.
Money very well spent!