There's a Greyhound bus leaving from San Diego, California at 9:05 pm tonight and arriving in Mexico City, Mexico on Wednesday 3/19 at 4:05 pm with only 2 transfers.
The Greyhound toll free number is 1-800-231-2222.
You can get to Mexico and decide to trek to the novelty-chip Mexican border city of Tijuana and hot-foot it back to San Diego across the border and forget the bus ride back.
Either way, you get a nice (and relatively cheap) ride to Mexico from California and perhaps enjoy an in-ride Greyhound service Hollywood (USA) film such as "Bolt" (2008).
This is comparable to traveling to other realms, since, of course, riding a bus across the border (you should plan to search for your own snacks along the way) is like a virtual reality mini-adventure.