DALLAS, June 13, 2016 /PRNewswire/ -- Greyhound, in partnership with Six Flags Entertainment Corporation (SIX), is offering a getaway for four with the "Live Unleashed Sweepstakes." Starting June 10 through Sept. 18, entrants have the chance to win a prize package that includes four tickets to a Six Flags theme park of the winner's choice including a VIP tour, free roundtrip tickets to get there via Greyhound, a two-night hotel stay, food, beverage and more.