Tijuana City and Shopping Trip from San Diego. This day trip to Mexico is a must for bargain shoppers, lovers of Mexican cuisine or those curious to see sights like the Old Bullring, Avenue of the Heroes and Plaza Rio. It's only a short drive from San Diego, but you'll feel that you've entered another world when you leave the United States behind and enter Mexico. Book now and Save 20%: Tijuana City and Shopping Trip from San Diego.