South of Tijuana and north of Rosarito Beach, the La Playa Ford Motocross has a motocross track open to ATV/quad riding. They also offer lessons once a month.
It is located at K24 Tijuana-Rosarito Toll Road in Rosarito Beach. To reach the dirt biking at the MX park from San Diego and LA: from Hwy 5 or 805 South, enter Tijuana, Mexico via San Ysidro. Follow the Rosarito-Ensenada TOLL-ROAD, look at the left at K24 on the Hwy (youll see the track there, continue for about 1/2 mile, make a "U" turn at the RANCHO DEL MAR off ramp, going over the bridge, get on the Highway back to Tijuana, and Slow down for a VERY TECHNICAL exit.
Overall, La Playa Ford Motocross is the 2nd most popular dirt bike trail of all 2 dirt biking rides in Mexico.