Patras has one of the more interesting bar and cafe cultures in the Peloponnese, driven by its large student population (the University of Patras is one of Greece's biggest) and its role as a transit hub that keeps money flowing through the city. The area around Georgiou Square is the obvious starting point — the arcaded cafes that ring the square are busy from morning coffee through late evening aperitivo — but the real energy is in the streets behind the square toward the Psila Alonia park and the neighbourhoods around the university campus.
Greek café culture means long hours over a single frappé or freddo cappuccino, which suits the student demographic well. The same cafes transition into bars in the evening, serving tsipouro (the local marc spirit), ouzo, and wine from the Achaia region. During carnival season the bars around Georgiou Square run essentially 24 hours for the final weekend. At other times of year Patras goes to bed earlier than Athens but later than most Peloponnese towns; there's consistently something open until 2 or 3am in the centre.