The Aleš River Bank
Lucky for you that Prague is such a beautiful town. If you can't roam the world, you can always take a walk on the river bank and admire the Charles Bridge and the Prague Castle.
If you're approaching the Aleš River Bank from the Mánes Bridge (Mánesův most) or the Palach Square (Palachovo náměstí), avoiding great Czechs on your way will be impossible. The concentration of famous figures of Czech history on one square metre is extremely high here. Good thing you can sit on a river bank bench and enjoy the exquisite view of Hradčany, Petřín Park and the towers of the Lesser Town. Or you can just lie down in the grass and watch the clouds in the skies.