Urgent! 柏林五天遊行程

I also think you don't need to spend 5 days in Berlin. I think 3-4 days is enough. Then you can visit one more place like Potsdam or hamburg.

Day 1
Unter den Linden -->Brandenburger Tor --> Reichstag --> Humboldt Universitaet --> Deutsche Historische Museum -->Neu Wache

Day 2
Siegessaule --> Schloss Bellevue -->PotsdamerPlatz-->
Alexander Platz -->Marienkirche --> Fernsehturm -->Nikolaiviertel


Day 3
MuseumHaus Am Checkpoint Charlie-->AlteNationalgalerie-->PergamonMuseum-->BerlinerDom-->Berlin Wall

Day 4
Schlosspark Charlottenburg-->Kaiser-Wilhelm-Gedachtnis-kirche
-->Kurfuerstendamm (do some shopping)

Day 5
Berlin-->Potsdam(45 mins S-Bahn) (visit Schloss Sanssouci)

I guess if u have 5 days, u need not spend all time in Berlin.
For Berlin, u can spend 1.5 or 2.5 days visit all the places or interests (must go to Charlie's check point & also visit the remaining "Wall")
For the rest of the time, u can go by day trips to other cities around, like Dresden, which is a nice & beautiful city to go.