Rather than suggest something you may not find interesting, I'll point you to another website instead.
Cruise Critic. Com is a site specifically focused on cruising. Especially if this is your first cruise, it can be a great learning tool. It has all kinds of special interest forums as well as ones for each cruise line (the Royal Caribbean forum is very active). There is also a Ports of Call Forum, with a large subforum just for the Caribbean. Each island has its own subforum, and should give you plenty of ideas.
Another forum you should look at is the Roll Call forum. There is one for each Cruiseline, with a subforum for each ship in the line. Within each of these ship subforums are further subforums for each specific sailing. Cruisers can join their Rolls Call and discuss plans for pre and post stays, shore excursions, and other topics specific to your particular sailing. You'll likely find some people organizing private excursions at some of the Ports. These are often excellent, since they tend to be much smaller than the same ship excursion, and at a better price.
Hope this will be the first of many great cruises for you.