Very nice, kayaks is a great idea.
Since you plan on renting a boat , I recommend doing some Spanish mackerel fishing. I drive my boat down to that area in the winter to catch them. So if you feel confident driving a boat and want to fish I recommend going for mackerel. It's in the Florida bay so you don't have to worry about large waves even when it's windy. Just make sure you have everything you need and primarily your licenses.
Regarding licenses, you'll need it anyways if you plan on collecting. Here's a link for regulations of aquarium species.
http://myfwc.com/fishing/saltwater/r...arium-species/
The site is easy to navigate so you can find game fish regulations as well and purchase your recreational saltwater fishing/collecting license online. I do it often for guests when I take them out.