That reminds me of Houston, Texas. They have what is called a Bordello tours, something like that. The bus load would drive you down to Nuevo Laredo or some other border town and back, thats a 5 hour journery. That one is good as most people on the tours are gone for one and done, and they dont like the hassle of experimenting and finding the hard way. The costs were not expensive, arranged accomodatoin and hey cool drive back and forth without the worries. Maybe the SoCal operators got idea from there