chris and mike: Do not take anything. Get a goodly supply of a good bug repellant and use it mornings and evenings. Also use socks and long, light trousers or pants. Skin, especially nice, new foreign skin attracts the mosquitos like bees to flowers...
There are local brands, available most everywhere, called "Deporte" and it works, too.
Oh yeah, this is 40+ years of experience here speaking to you with no, not one, incidents of mosquito borne illnesses.
HB