I've never been to the PI,but I've been to many other places where I'm not already acquainted with the local 'bugs'.
I was going to type this out myself, but the CDC does a good job.
http://www.cdc.gov/travel/other/traveltips.htmBe Smart While You Travel
-Wash your hands often with soap and water. If soap and water are not available and your hands are not visibly dirty, use alcohol-based hand gel (with at least 60% alcohol) to clean your hands. If you are going on a cruise, read this fact sheet about handwashing (in Adobe PDF format), and reducing other health risks while on a cruise.
-Drink only bottled or boiled water or carbonated (bubbly) drinks from sources you trust. Do not drink tap water or fountain drinks, or eat ice cubes.
-Only eat food that has been fully cooked or fruits and vegetables that have been washed and peeled by you.
Remember: boil it, cook it, peel it, or forget it. -If visiting an area where you might get malaria, make sure to take your malaria prevention medication before, during, and after your trip, as directed.
If you might be bitten by insects (like mosquitoes or ticks) use insect repellent (bug spray) with 30-50% DEET. The label on the container will tell you the DEET content.
(I personally skip the malaria prophylaxis because of the side effects I've experienced)
-Make sure you know how to protect yourself from injury while you travel. Motor vehicle accidents are a leading cause of injury deaths in travelers. Swimming-related accidents are also a major cause of injury among travelers.
-Avoid poultry farms, bird markets, and other places where live poultry is raised or kept
Do not handle animals, especially monkeys, dogs, and cats, to avoid bites and serious diseases (including rabies and plague).