Guests who book three nights at any participating Preferred Hotel Group hotel or resort worldwide through Dec. 31, 2012 and pay with a MasterCard will receive a complimentary fourth night.

Participating hotels include the Waikiki Parc Hotel in Honolulu, Draycott Hotel in London, Grand Hotel Minerva in Florence and Palace Hotel in Copenhagen. Advance reservations are required. Visit http://www.phgoffers.com for more information.