OK, it's pretty well known that gas prices are cramping everyone's style. It means that everything is costing more: groceries, utilities, mass transit, postage, you name it. But it doesn't mean that your summer vacation has been put out of reach entirely. Even though it costs significantly more to drive places, there are still ways to cut back on vacation costs. Yes, gas is creeping towards $4 per gallon, but you can make that gas work harder for you.