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This might be interesting if you're in the Kreuzberg / Neukölln area:
https://www.lfgss.com/comments/10129703/Also there's "Yellow Sunshine", a veggie/vegan fastfood joint.. personally I'm not a huge fan, but a lot of people (even some meat eaters I know) really like the food.
As for "things to do" - I don't know, read a book maybe?
Just kidding, but seriously I don't know you so how would I know what you'd like to do..
Any recommendations for Berlin? Food, things to do etc.