U.S. citizens require no vaccines to visit Baja California.
However, the Center for Disease Control and Prevention (CDC) advises that travelers should be up-to-date on routine vaccinations.
The CDC also advises the following inoculations: hepatitis A and B, typhoid, malaria and rabies.
FOOD AND WATER
While Baja California's water is generally safe, it’s always helpful take precautions about what you eat and drink while traveling. If you're cautious, avoid drinking tap water and drink purified or bottled water instead. Street food offered by vendors presents the highest risk to travelers as an authorized regulatory organization may not have ensured proper hygiene.
With Baja California's high temperatures, sun and heat exposure along with dehydration can present health risks to travelers. Keep hydrated, use plenty of sunscreen and limit sun exposure when possible.
Taking out travel insurance helps protect against illness, injury, theft and loss. Many travel insurance policies exclude activities considered as potentially “dangerous sports” unless one pays an additional premium, so it's best to thoroughly read the policy and plan according to your itinerary.