I don't take malaria pills, there's also the possibility of dengue fever from mosquitos and those damn sand flies can be really annoying. Rather than cover myself in a chemical soup of sunscreen and bug repellant I prefer to employ physical barriers like wearing long sleeves, long pants, and yep, even socks at times as well as heading indoors at those times when the bugs sre out and biting.
Yea, sure, it cramps my beach bum style, I like to strut around in my tangerine speedo as much as the next guy but IMO it's worth the hassle of carrying around the anti-bug, anti sunburn clothing in my bag "just in case".