Book four nights using your Visa card, and you will receive the fourth night free at a Hilton Caribbean, Hilton Latin America or Hilton Central America hotel or resort until Dec. 31, 2007. And if it’s available at check-in, you will also receive a free room upgrade. If you’re bringing the kids, you might want to consider visiting the Caribbean to enjoy Hilton’s Very Important Children program where kids stay and eat for free. Book using plan code PR50VS and don’t forget to pay with your Visa card.