Why not take a FREE Water Taxi to Yankee Stadium or Citi Field?
This baseball season, Delta will once again be sponsoring free ferry rides with NY Water Taxi to take NYC commuters to Yankees and Mets games. Ferries will depart South Street Seaport's Pier 17 90 minutes before each home game for either team. You may also board at the East River stop on E. 35th Street, 70 minutes prior to Mets home games and 60 minutes prior to Yankees home games.
Only 147 tickets are available for each ride, so book online (for a $1 per ticket service fee). You may also take your chances obtaining walk-up tickets at Pier 17, two hours prior to departure (NO walk-up tickets available at E. 35th St).
See the full schedule and more info here.
Unfortunately, there is no return service after the game, so remember to keep your Metrocard handy.