Many world famous sites are found along these banks.
From the Louvre to the Eiffel Tower, from the Place de la Concorde to the Grand and Petit Palais, the evolution of Paris and its history can be seen from the River Seine. The Cathedral of Notre-Dame and the Sainte Chapelle are architectural masterpieces while Haussmann's wide squares and boulevards influenced late 19th- and 20th-century town planning the world over.
The banks of the Seine are charming on both sides. This is where you will find most of Paris's 'bouqinistes' or used book-sellers. The pedestrianized Pont Neuf bridge is popular with young picnickers, who come here with bread, cheese, and wine in the evenings to take in the city's sunsets.
This is a great place to enjoy the essence of Parisien. A tour around (and inside) Notre Dame opens up the world of Gothic France and in the process you discover WWII (through the Memorial to the Martyrs to Deportation) and modern Paris (through the major police station). Of course, Roman Gaul exists at Arenes de Lutece.It has the charm of a relaxed residential community with a touch of tourism that Notre Dame affords. The local cafe scene is the uncommon combination of very French and very welcoming. All in all, a great way to spend a day.