Discover Warsaw: Vistula River (Wisła) 1 Multimedia Fountain Park Fountain complex operating from May until September. Free entrance. Each Friday and Saturday evening multimedia show (fountains, laser, music, and lights). Click here to read our tips on the Multimedia Fountain Park. 2 Small Playground at Karski Boulevard (Bulwar Karskiego) 3 Free ferry across the river “Wilga”…