It's a friendly wager that will include a basket with the best the cities have to offer.
Napa Valley wine, sourdough bread, Ghirardelli Chocolate from San Francisco, Utz potato chips, cream of crab soup and Brody's wine from Baltimore.
The park president from the losing team will have to wear the rival team's jersey and cap for a day and put a gigantic banner outside the park congratulating the winners.
49ers Coach Jim Harbaugh is no stranger to Six Flags. He joined park executives last June on a preview ride of the new rollercoaster Superman: Ultimate Flight.