We were down there last week, and there were a fair amount of skeeters. Mostly of the smaller variety but sometimes hard to tell how large they were during the early morning or near dusk. Lot's on Anegada and Norman as I recall. Members of my group complained about getting "eaten alive" hiking on Sandy Cay. Not many on the boat but it depended on prevailing winds light or heavy and how close in your mooring ball is to land, etc. So far no member of our group has come down with anything. Agree that it's best to use deet (or picaridin if you have trouble with deet). Daily routine on the boat was navy shower, sun screen then insect repellent. Did it religiously every day and repeat as needed during the day, after swimming etc. And because I have quite bad arthritis I elected to try some insect repellent clothing in addition to deet. Pricey but generally worked very well. Btw, if you open the hatch to catch the evening breeze remember to use the screen if your boat has one. My one mistake the first night resulted in a few bites. Below is the "stuff" we used.
http://www.columbia.com/technology-insectblocker/http://www.haeleum.com/http://www.amazon.com/Sawyer-Products-Pr...rds=sawyer+deethttp://www.amazon.com/Sawyer-Picaridin-S...awyer+picaridin
