Hey San Franciscans: A colleague of mine is driving into San Francisco on Friday for a weeklong trade show at the Moscone Center. She's staying at the Hilton San Francisco at 333 O'Farrell Street. Where can she park her car for a week in the city (preferably near the Hilton) that's safe and reasonably priced? (I'm assuming hotel parking will be outrageous.) Any trusted garages you'd recommend?