Families in cars stacked with surfboards cruise into the San Mateo Campground on the northern edge of San Diego County. Clear skies beckon them for a weekend of beach camping. But drive inland 4 miles. “#AudreyandEmily have been found!” the San Mateo County Sheriff’s Office tweeted Thursday evening. “We checked in & saw both of them. They are in good health & simply enjoying their California camping. San Mateo County…