Shall we walk up the hill, climb the stairs of the old church/tower? take the funicular/the elevator/the chair lift? dine at the restaurant at the top of...? do it at the beginning of the tour, towards the end of the tour? all of it?
A panoramic view is a Must as it offers some of the most exquisite moments in one's life. Who could ever forget the panoramic view of the Bay of Naples from the top of Mount Vesuvium in Italy, or the view of Athens from the Acropolis in Greece, for instance. Certainly Not Me.
In Prague there are quite a few spots that offer a stunning panoramic view of this fascinating city: The astronomical Clock Tower, the Powder Tower, the Ziziko TV Tower (pobably the highest place not only in Prague, but in the entire Czech Republic) , the Castle, the french Restaurant on top of the Dancing House, etc... The above mentioned towers and the Castle are the most famous attractions in the city.
If it's a clear , nice day, I would strongly recommend the Petrin Hill for a panoramic view of Prague, and not only for this. The Petrin Hill is home to lush gardens, a house of mirrors, churches, and...a look out tower ( copy of the Eiffel Tower, 60 m high, 299 stairs to climb to the top platform, unless you decide to take the elevator).