What to do while in Berlin on a 4 Night, 3 Day Weekend trip?

December 27, 2006 7:54am CST
I'm going to be in Berlin next month for Friday, Sat and Sun and want to know what there is to do there. Are there any theme parks worth visiting which will actually be open in the Winter? If so how to get there via U or S Bahn and entrance cost per person? Advance booking? What kind of facilities and rides do they have?
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