There's a new health threat to be aware while you're exploring the outdoors, especially for pregnant women; the Zika Virus. WHO declares global health emergency. You definitely want to minimize your exposure and risk with the usual precautions (proper clothing, mosquito repellent, etc.)
Although the mosquito-borne virus’s symptoms are relatively mild (in healthy adults), it is believed to be linked to a surge in cases of microcephaly, a condition in which a baby is born with an abnormally small head and brain.
The virus is prevalent in the northern half of South America, Central America, and Mexico already and is expected to expand rapidly to the US.