My experience with Amsterdam is that you need to get to the Anne Frank house early. The lines were long going down the street. In the limited time you have I think one of the canal rides would be nice. You can get off and on at stops, or you can just stay on for the whole trip. It is a nice ride through the city and they give narration of history. The Heineken Brewery is also interesting. If your into Museums and Art they have the Riksmuseum, and Van Gogh.
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