Paying income taxes is a bummer, but getting your refund back can be a pleasant surprise. According to Motley Fool, the average U.S. tax refund rings in at $3,120. That's a world of potential. DK Eyewitness Travel, a major publisher of travel guides and books, has rounded up a list of 10 vacations the average tax refund will cover. So get inspired, file by April 18 and book it.