Take the river cruise . It was worth the money. We passed beneith some bridges and you'll see the city from different angle. You'll even get a hand wave from passing bye tourists.
This view shows the graceful arches of Charles Bridge. The bridges are, in order, Manesuv Most, Karluv Most, Most Legii.
I saw a really nice view of Prague's bridges on a postcard photo which must have been taken from the hill in Letenske Sady. Though I never found the right spot. this view comes the closest.
Vltava River with its beautiful swans. On the background you can see couple of bridges and even the St.Vitus Cathedral (very far away though).
Take one of the many river-sightseeing boats.
You will get a nice overview of the many historical sights and buildings.
If you need a break why not stop at the Strelecký Ostrov, the 'shooters' island. You will hav a nice view over the Moldova and the charles bridge from here....
Very enjoyable way of spending a couple of hours with a great opportunity to see the City from the river.
there are many options available.
We went for the Lunch Cruise (2 hours)