Check out this NOAA site- PDF's of smaller charts you can look at on your computer for info. I'd compare these with Google earth to come up with an idea of where you want to go.
http://www.charts.noaa.gov/PDFs/PDFs.shtml
Good luck and if your worried about mosquitos use a bug spray with deet. Not sure if they are worse down there but not a huge issue near me due to control efforts and even in remote areas not bad from lack of standing fresh water. Control efforts may be less down there due to smaller human population and tourism where you are looking than near me. Long sleeves and pants help too.