Do you feed swans? 
There are several places in the city center where you can feed swans and enjoy the wonderful views of the Vltava river:
near the Museum of Kafka (Malá Strana)
Náplavka (Rašinovo nábřeží) embankment
Smíchovská Náplavka
Streletsky island (Střelecký ostrov)
in front of cafe Bohemian (Malá Strana)
near Muzeum Bedřicha Smetany (Novotného lávka, Old Town)
https://www.instagram.com/p/BXAi2OdleQV/?from=praguetoday