For a Hipster Coffee Fix:
Neukölln: Two Planets
Charlottenburg: Giro Coffee Bar
For a Walk in the Park:
For a Burger Fix:
Grab a Beer and Walk the City:
* Try Karl's Strawberries. There are stands all around the city. You can't miss them because they look like giant strawberries (they're painted red).
* If you'll be in Berlin for at least 7 days, it's worth it to get a 7 day metro pass. They're affordable. I got mine at the Tourist Office in the Central Station.
* Berlin is a hard city to walk. It's huge. You'll want a good pair of shoes and plan on learning your way around the metro/tram/bus/train system to help you get around.