Anything you're looking for in particular? Know where you'll be staying? Recently moved back from Berlin to Wisconsin, so just sad-venting all the things I miss:
Sites: Treptower park (incredible Soviet WWII memorial), Tempelhofer Feld, Oberbaumsbruecke (beautiful bridge connecting Kreuzberg & Friedrichshain)
Bars: Vagabund Brauerei (craft brewery in Wedding), KEITH (Neukoelln), Ä (and other bars on Weserstr. in Neukoelln), Hops&Barley (German brewpub), most shitty old Eckkneipen (corner bars)
Clubs: About:Blank, Salon zur Wilden Renate, Griessmuehle, Golden Gate (honestly I didn't go out enough...)
Food: Azzam (Neukoelln), Markthalle 9 (market hall in Kreuzberg), Turkish Market on Maybachufer (Tuesdays/Fridays in Neukoelln/Kreuzberg), Thai Park on weekends (open air Thai food market in Wilmersdorf), Ixthys (great Korean spot w/ oddly heavy Christian vibes in Schoeneberg), Safari (West African food stand in Wedding. my fav), Mustafa's (touristy Kebab stand, but the best in town imo)