I disagree with Shari.....*I* am the mosquito magnet of the world! (Although, I must defer to her as she contracted DENGUE FEVER and I hopefully never will! It's ugly, folks! Ask her!)
But back to the repellent discussion: I remember my first visit to San Blas (Nayrit, Mexico---a sweet, sweet, cheap beach town) when I refused to put "chemicals" on my skin. The next day I was looking for DDT.....and didn't give a rat's ass about the side effects. To this day, I consistantly cover any exposed skin with the strongest (and safest) chemicals available.
The best and most preferable repellent is a strong breeze....or sitting under a fan set on "lift the roof."
Yet, if I were sitting on a gorgeous Carribean-facing-veranda eating fresh conch ceviche, I cannot even imagine worrying about mosquitoes......
as ever, (and yet)
P.S. No-see-ums are tiny black biting knats. I am unfamiliar with them in Belize---having been occupied by the big biters---but my other Central American experience with them is that their bite feels like a fiberglass sting.