Unlimited discretionary income will let you fly to the world's most luxurious yacht by helicopter. Welcome aboard the late Aristotle Onassis' Christina O. Fresh from a three-year, $50-million, state-of-the-art restoration, the legendary 325-foot-long super yacht is now offered for charter to mere mortals for a modest $70,000 a day. Its 18 staterooms have hosted a veritable who's-who of the rich and famous, from Sir Winston Churchill and John F. Kennedy to Marilyn Monroe and Frank Sinatra. Besides a spa, fitness center, sports lounge, music lounge, show lounge, and a swimming pool that becomes a dance floor with the push of a button, Christina O has all the toys you could wish for. There are no immutable itineraries, but for a first stop we suggest soaking up the glamour of the French Riviera in Cannes.