Got preschoolers? Like saving money? Take advantage of the great travel deals that pop up late summer when older kids head back to school.  Case in point: Stay in a ResortQuest vacation rental property (condos, villas, and homes) on South Carolina's Hilton Head Island and you'll enjoy warm temperatures, uncrowded beaches, the comforts of home, and free gas.  Book three nights or more in a two-bedroom or larger unit between August 23 and September 12, 2008 and receive a $200 gas card when you arrive.