Most city residents head home after work in a city that's not noted for its raucous nightlife. But the bar that attracts more business than any other, Le Papillon, is in the Hotel Chlosterhof, Oehningerstrasse 2 (tel. 052/742-42-42). It opens every night at 6pm and offers lots of varnished paneling, a woodsy kind of coziness, and views of the river. They will happily stay open until the last customer leaves.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.