Get tickets to see a game at F.M. Palacios Field. If there's nothing on while you're in the area, you might like to check if the stadium offers a guided tour of the grounds.
When you've finished up at this Saipan sporting facility, why not check out Managaha Island, Lao Lao Bay Golf Resort, and Coral Ocean Point Resort Club? They're not far from F.M. Palacios Field and also a hit with travelers.