Not a timely response to your question, but hopefully this still finds you before your visit. A pretty good resource on Zika in Mexico: http://www.bajainsider.com/article/zika-virus-mexico . Of all the different parts of Mexico, Baja California Sur has been minimally affected, having not reported any cases at all until a week ago. There are now 2 reported cases (out of over 4,800 country-wide).