You can find out about the history of Slavonski Brod when you stop by Brod Fortress. Stroll along the riverfront or visit the temples while you're in the area.
The centre of Pakrac is home to cultural attractions like Packrac Town Museum, so you might want to stop by during your stay. If you want to experience more of the culture Pakrac has to offer, head to Lipik Hospital and State Stud Farm Lipik.