Hey Sean,
What you pack will depend a lot on where you're going, when, for how long and what you plan to do. If you want to go hiking, you'll need different stuff than if you plan to spend three months on the beaches, for example.
There are a lot of threads on this site that talk about this topic, some in terrific detail, so take a look at them, and see which ones work best with your plans. I think one of them is called "What do you carry in your pack", which would be a good place to start.
When you've got an idea of what YOU think you'll need, be sure to post your list, and people will let you know if there's anything critical you've left out, or if there's something that you probably won't need, that'll lighten your load.
Happy planning!