There is no doubt Leiden on the Rhine (old and new) is a pretty town. Easily walkable as it is not very big. If you go to Visitor Centre next to Centraal Station you can pick up a map and follow a loop self guided walking trail that takes in the Rhine, some lovely windmills, Rembrandt's birthplace and the old wealthy district of Rapenburg. Well worth a few hours and the sign boards along the way have English and Dutch to explain what you are seeing.
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