I will have half a day to spend in Berlin, on a Saturday afternoon. What do you recommend I should go and see/taste? I am not aiming for classical "tourist" spots, as we have a guided city tour before, hopefully it will show all the interesting spots, but much more the the things that are not so obviously on the must see and do, but they are still interesting.

Also, can someone recommend a Toy store in the area around the Tiergarten?