axi Libre" or "Taxi Economico." These cost $3 USD to get downtown and the prices are all listed on various boards.
If it's during the day then you could walk to downtown. Follow the signs that say to Centro. You'll walk across a long bridge, and generally head toward the Revolution Arch.
Car
While in the San Diego area, take I-5 or I-805 to south. Either park at the border and continue on foot or drive into Mexico. Driving from the US to Mexico often requires no stopping, but inspections driving south have become more frequent as authorities attempt to stop firearms trafficking into Mexico, resulting in long wait times during periods of heavy traffic. However, driving from Mexico to the United States will result in a long wait, even more so during evening rush hour or on holiday weekends.
If you are driving to Mexico, obtaining Mexican insurance with legal defense coverage is highly recommended, and can be bought immediately before crossing the border, or even online before your trip.
When coming into the US, the Otay Mesa and Tecate border crossings, also nearby, may sometimes be less congested. To get to the Otay crossing can be a little scary (not good for Gringos at night) and the border agents here don't seem as pleasant as the ones at the San Ysidro crossing.
If the pedestrian line returning to the US is long, it may be faster (in some cases) to take advantage of the numerous van and bus lines that cross the border. You will undoubtedly encounter agents for these services when approaching the pedestrian line back to the U.S., who will ask for $5 to $10 per person to let you board the vehicles which are already in line. Generally, the closer the vehicle is to the front of the line, the more they will charge
