Does anyone know of any tours from Las Vegas to San Francisco?

My husband and I are visiting Vegas in August for a week...we also want to see San Francisco(sorta like a day trip). Question is does anyone know of any tour companies that will take us from Vegas to San Fran for a day? I really don't want to drive or take Greyhound(its way to long). Any help would be great. Best answer is gets 10pts.