Talk about a win-win — take a look at Prizeo, where celebrities offer chances to win once-in-a-lifetime, dream-come-true prizes to people who support their charitable causes. Sir Paul McCartney, Miley Cyrus, Zac Efron, Jeff Gordon, One Direction, Lady Antebellum, Hunter Hayes, David Ortiz, George R.R. Martin, Roger Daltry, and many more offer meetings, tours, and VIP concert tickets. Take a look, do some good, and who knows, you might end up taking a helicopter tour with the guy who wrote Game of Thrones or hanging out with the Sports Illustrated swimsuit issue models. Good luck!