What to know before you go
If you've ever made the trip down to Tijuana, the same rules apply here. If you’re driving, make sure you buy a Mexican insurance policy valid for every day your car's in-country, which you can do online before you leave. Uber is a good option for those walking across -- it’s in various stages of being under siege, but is currently operating within the region. And yes, you need a passport, as you have since September 11, 2001.
Also note that California residents are only allowed to bring back one liter of alcohol per person, which is a little more than one bottle of wine. Oh, and don’t buy drugs or pee in the street. Other than that, be respectful, say gracias, and enjoy both the tacky and beautiful aspects of life in Rosarito.