The cruise lines will generally describe their different ports of call on their website, but you are only getting what they want you to know, and of course are geared to sell their cruises and tours. In our opinion the best way to research different destinations offered on a cruise is to first select the destination, cruise and cruise line. We use http://vaacationstogo.com to find the right cruise that meets our needs. We then use several search engines like Google, Yahoo, Bing, Ask, etc. Even Wikipedia is a good resource to get the information you want to know about the ports of call.
Thank you for taking the time to peruse the questions we have answered over the past few years.