Berlin to Amsterdam

[kendrick]

My friend and I are from California and are planning a trip to Europe this summer. We are going to London and Berlin (flying into London then taking an easy Jet flight to Berlin). I have heard good things about Amsterdam and the "rail and sail" from/to London seems not too expensive. My question is if Amsterdam is worth taking the time to travel to, considering we are going to be gone for 14 days (the first and last day being completely taken up by travel, so more like 12 days in Europe).
Thanks for any suggestions
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Berlin to Amsterdam