Princesses and paupers alike, i.e. management and employees together, went out to clean up the beach opposite the Princess Hotel one day a couple of weeks ago.   The annual beach cleanup day has become a hotel tradition.  The hotel staff went out armed with gloves and plastic bags to attack the rubbish strewn along the beach nearby, in an operation coordinated with the Nature Reserves and Parks Authority.  The Princess Hotel management, which last August won an award of five ornamental flowers as recognition from the Beautiful Israel Council, always makes sure the hotel and its grounds are kept clean.