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If you are in Schleswig-Holstein or Hamburg, visit Helgoland. This island and holiday resort makes for a nice day-trip with bird watching opportunities, plenty of original Northern German restaurants and tax-free shopping.
You might also want to go to the Hanse city of Luebeck to see buildings dating back to the 13th century, or to the sea castle of Gluecksburg, which was the residence of the dukes of Holstein-Sonderburg-Gluecksburg during the 17th & 18th century.