Buy a ticket and join the fans at a game at Pampeloponnisiako Stadium. If there's nothing on while you're there, you might like to check if the stadium offers a tour of the facilities.
If you're staying a while in Koukouli, Pampeloponnisiako Stadium is a good place to start your exploring. This sporting facility is one of numerous attractions that'll keep you occupied here. University of Patras, Georgiou I Square, and Hellenic Open University are also waiting to be discovered nearby.