Feeding swans, ducks and seagulls on the banks of the Vltava

Don't know what to do and don't want to spend the afternoon around historic buildings? So why not take a trip to the bank of the Vltava, perhaps to the floodplain and feed the swans and ducks and seagulls present everywhere. 
Of course, this is possible not only at the Vltava, but since it is the closest for me, I take, for example, the tram to the Palackého stop or the metro line B to Karlovo náměstí and get off in the direction of Palackého. Options where to go to the shore…