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Side trip to Cologne

We are taking the Germany tour June 2nd. We are arriving 3 days early and want to take a trip to Cologne before the tour begins. Has anyone done this before? We have gotten hotel reservations across from the train station in Cologne. Can we store our extra luggage in Frankfurt and not have to take it with us to Cologne? Also, we are staying an extra 2 days in Berlin. Any suggestions for restaurants?
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