Nice theater with a bar. A place for art work and to meet people. Inexpensive.
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Kunstmuseum Luzern
Kultur- und Kongresszentrum Luzern
The KKL is a spectacular building that contains several concert halls and the Lucerne Art Museum. It was designed by Jean Nouvel. Its major concert hall ("La salle blanche") is famous for its acoustics, and world class orchestras can be heard regularly. It hosts the Lucerne Festival (classical music).
Lucerne has an excellent bicycle Network. Rent a bicycle at the train station in lucerne and explore the city and the suburbs or make a day trip on the national bicycle network (http://www.veloland.ch/en/veloland.html).
Take a boat tour on the lake Lucerne with the traditional steamboats. A ride along the full length of the lake (Lucerne – Flüelen) takes approximately 3 hours. The lake has several tight bends and the landscape changes dramatically during the ride from the high mountains around Flüelen to the gentler hills around Lucerne. The villages and towns along the lake are generally very nice places to take a relaxed day with a walk/swim and food at the lakefront - Weggis and Brunnen for example. Flüelen and Brunnen at the far end of the lake can also be reached by direct train from Lucerne.