I'd have to agree with Jack...
While Mosquitos have been known to carjack the occasional tourist down here (we are in the everglades, you know. There is one species here slightly smaller than your thumb), the nightly invasion of no-see-ums along the beach will reduce the strongest people to tears.
It's almost fun to go to the beach for sunset, and while you're making a hasty retreat at dusk you start to hear the screams of the drunks who are still lying on the beach...
And from what I can tell, there is no really effective pesticide for those thingies (well, besides DDT but I don't think that's legal anymore)
I did a little reading on them a while ago and workers in tropical island areas were slathering up with 40wt motor oil. Doesn't repel them but they get caught up in the oil. Avon skin so soft works fairly well if you keep applying it but then they'll start biting your head.
