Some people are bothered by them more than others. Myself, I have very rarely been bitten. there is usually enough of a breeze to keep them away. If you go up north in the more wooded areas you may have some. As always it depends on how much rain there has been at the time. May is not in the rainy season. I have been down many times and most people with me get by the full week with a small can of OFF or as I do, nothing at all.