ASAP you should try to get a tour through the Parliamentary buildings. It is probably too late already, but certainly worth a try.
http://www.bundestag.de/htdocs_e/info/050vberl.htmlAlso: on the 27th and the 28th all Federal ministries will be open to the public (among them the Chancellery) . The queues will be very long, so it might not be the best investment of your time.
Now to the "how and what to do" :D
The way to get around in the city is public transportation: fast and it covers pretty much every square inch of the town (with the notable exception of our beloved small airport). Tickets work on a honor basis; there are no barriers hindering ticket-less people entering the trains. But there ARE plain-clothes ticket controllers - believe me, you'll want to have a valid ticket.
The best approach is to buy a three-days or a week-ticket (depending on the length of your stay).
And never buy a newspaper while on a train.
http://www.bvg.de/e_index.htmlThe other things important in this regard are shoes: Berlin covers an area bigger than NYC (all five boroughs) - the distances can get quite long. (Cabs are expensive, but easy to find and plenty)
Sights:
I'd say the "have to"s are (:
-Reichtstag Building
-Brandenburg Gate
-Holocaust Memorial
-Wall Memorial Bernauer Strasse (the one at the Checkpoint Charlie is a fake - a tourist trap)
-the Jewish museum (
http://www.jmberlin.de/index_e.html?meta=TRUE)
-The Museum Island (
http://www.smb.spk-berlin.de/ ;
http://www.smb.spk-berlin.de/smb/en/standorte/index.php?objID=3313&n=2&p=2)
--The Pergamon
--The old Museum (Altes Museum)
--The old national gallery
--The Cathedral
-The new national gallery (
http://www.smb.spk-berlin.de/smb/en/sammlungen/details.php?objectId=20)
-The Einstein exhibition (
http://www.einsteinausstellung.de/)
...
Worth a visit are:
-(if you are so inclined) visit a Hertha (soccer) match
-The Helmut Newton exhibition (
http://www.smb.spk-berlin.de/smb/en/sammlungen/details.php?objectId=7191)
-The Flick Collection (
http://www.smb.spk-berlin.de/smb/en/sammlungen/details.php?objectId=7201)
-The Guggenheim (
http://www.deutsche-bank-kunst.com/guggenheim/)
...
If you have the time, Potsdam is definitely worth a visit. Be warned however; finding an English speaking guide can be difficult - Russian is still the language of choice there. Also, while you're in the area, Einstein's house might be interesting (
http://www.expatica.com/source/site_article.asp?subchannel_id=26&story_id=20460&name=The+house+that+Einstein+loved)
Also Berlin is the home of several first-class orchestras and stages. The directors tend to be pretty unconventional: even in the most classic pieces you should not be surprised by shower-scenes, orange juice fights, mud wrestling and similar plot devices.
Shopping:
As mentioned before, the KaDeWe is a great department store. However, they are renovating it at the moment, so that most of it looks like a construction site. The LeFayette at the Friedrichstrasse can be a good replacement.
The international designers have stores on the Friedrichstrasse in the center and the Kurfürstendamm (Kuhdamm) in the west. There are several small start-up designer stores around the Helmholtzplatz in the Prenzlauer Berg district.
All prices are including tax (which you can get back when leaving the country), almost all stores are closed on Sundays.
Culinary things.
Berlin still has way to catch up in this department, yet first-class restaurants of almost any category (cuisine- and price-wise) can be found somewhere. (personal recommendations (reservation required): Chinese: good friends, Kantstraße 30; Japanese: Sasaya, Lychener Str. 50; local cuisine (prices slightly above moderate): Weinstein, Lychener Str. 33; Pizza (nothing else): Due Forni, Schönhauser Allee 12; cafe: Café Einstein, Kurfürstenstraße 58 ...)
The local specialities are Döner and Currywurst, I strongly recommend you try both.
For Döner, the place of choice is Saray (
map): order a Dürüm Döner "komplett" - the best food €3 can buy.
For Currywurst it's "Konopke" under the subway, near the station "Eberswalder Strasse".
The Coffee-chains of choice are Balzac and Einstein.
Prices are including tax and service; 10% is considered a good tip.
Last but not least: it's election time - say hello to the gals and guys from the SPD . It means a lot :D .
If you want further details: just ask :hi: