The Vistula boulevards
The river boulevards below the Old Town fill with bars every summer; Cud nad Wisłą and Hocki Klocki are the two that come up for Friday.
When: May to September. The bars pack up when it gets cold; in winter the boulevards are a walk, not a night out.
Photo Arne Müseler, CC BY-SA 3.0 de, Wikimedia Commons.