Visitors to Tijuana Mexico or Ensenada only need to walk (or drive) across the border. Since Tijuana Mexico Thrives on tourism (being the most touristed city in the world), the authorities in Tijuana try to make entering Mexico as quick and easy as possible. There are no declarations to make, and no questions will be asked. If you want to visit Tijuana, just come on in. If, however, you are planning on staying for more than 72 hours, you will need to get a tourist card on your way in (ask for directions at the border).
