Used to boat camp on the dunes a lot. Find an island without a bunch of brush or shallow marshy stuff around. The brush isn't so bad, but you hang out any where near a marshy spot, you are into bugs. Look at the brush areas next to the bank, As the water drops foliage collects around the root system and creates a mushey area as it rots, a breeding spot for any thing that bite's. Those Horseflies are terrible if in the wrong area. A couple of dunes over and it might not be bad at all.
Goose island is another story. Spent my 20th b-day there with a keg of beer buried in the sand and some friends. I hate to see what it has turned into.