If you drive across, stop and purchase car insurance at any of the booths. Most car-rental companies do not allow you to take a car into Mexico, so check first. Head south on the Ensenada Toll Road for 30 more minutes to reach Rosarito, a favorite of movie stars in the '20s and '30s and still known for its wide, sandy beaches. Puerto Nuevo, a little south, is an entire town dedicated to lobster restaurants. All have safe and delicious food, because U.S. tourists are the town's mainstay.