Purchase tickets to watch a game at Pohlman Field. If there's nothing scheduled while you're there, you might like to check if they give a guided tour of the grounds.
You'll soon discover why this Beloit sporting facility is visited by many travelers. If you're searching for more to explore, Pearl Lake, Logan Museum of Anthropology, and Historic Auto Museum are in this area too. They won't take you very long to reach from Pohlman Field.