Even a day at the beach is done in presidential style for the First Family.Currently enjoying a relaxing California vacation, Michelle Obama and daughter Sasha arrived at the extravagant beachside mansion of billionaire financial mogul, Howard Marks, on Wednesday afternoon. RadarOnline.com exclusively learned that mother and daughter pulled into the luxurious private estate in Malibu over looking the Pacific Ocean at 3 p.m. They were escorted by a police motorcade and spent a perfect summer day by the beach.So far, the First Family has been experiencing the Hollywood highlife during their trip....