(Walking into Tijuana), From the San Ysidro Trolley Station, Follow signs to Border (Walk east on Rail Court) and turn right, which takes you to the border. You will see a big gray sign that says "Mexico" and turnstiles. Thru, right and follow the stairs thru the Mexican customs building where they might check your bag. Once thru, then outside down the stairs until you are crossing the line (Linea) Walk parallel against the line until you see the big, gray bridge. Walk up the left side which says "Tijuana Centro." Not the right that says "Taxi"
Walk over the bridge and it drops into a "market" and you will see the Taxi terminal on the left. Walk (west) thru the "market" to Av de la Amistad. Cross the street and you are in front of a McDonalds. Turn left and walk (South) to the corner where you turn right. Next to the large corner building (one building from the corner) is the ABC auto bus terminal. Buy tickets to Ensenada Central at the counter. Currently about $13 US. 90 minute ride with a movie showing.
click link for marked map (or copy and paste)