I haven’t been to Berlin in far too long, but still have lots of friends who live there and visit me regularly in Las Vegas.
So much to do in such little time.
As mentioned by Darryl Lict (great name!) those museums are all worthy of a visit, but will kill hours and hours of time. Great for a rainy day though. Weather of late has been rainy - and also a bit hot and humid, so that might be a plan/factor.
If you want to do outdoor things, there is a great Zoo smack dab in the middle of the city, with a nearby aquarium. Plus, there are some really cool boat rides where you could just relax, see the beautiful sites and have some great German coffee and cake while cruising down the rivers and across the lakes! Berlin is surprisingly a very green city, with lots of forests, lakes, parks and waterways.
The department store, KaDeWe is a great place to wander - the two entire top floors of food alone will make you drool…pastries, wursts, wines, cheeses…plus the other floors of fashion and other trinkets to look at. One friend of mine from NYC went there and said, “KaDeWe makes Bloomingdales look like KMart!”
The night life is fantastic - so choose carefully; music clubs, dance clubs, sex clubs, local bars - lots and lots of options! Remember, some of those bars are open 24 hours a day, so don’t be afraid to go late - most people don’t even venture out to the clubs until at least 11:00 PM at the earliest! And yes, even during weekdays!
Earlier in the evening, you might want to hit a cabaret, drag show, opera, musical or concert; check the listings or ask at your hotel what is on that night and about getting tickets last minute (might not be easy).
There is also some amazing architecture - new and old - that is worth seeing; stick to the Alexander Platz area (old center of East Berlin) and you will get a bit of everything within walking distance. (The Pergamon Museum is easy walking distance from Alex (the short name for Alexander Platz) assuming it is not raining.
So, without knowing exactly what you want to do, or your interests, those are a few tips. However, as I tell people coming to Las Vegas, be careful of arming yourself with a long list of “must-do’s” as you will most likely not get far on the list. Berlin is the same - I would just head towards the center (Alexander Platz - city center of old East Berlin) or the (Gedanknis Kirche - city center of old West Berlin) and just let the muse strike you…wander, and enjoy!
Report back and let us know how things went!