Bicycle Tours. Year-round, Monday, Wednesday, and Friday at 10 am, you can take a three-hour bike tour from the Hauptbahnhof for around 50 SF (rates according to the number of people in the group). Tours are available in English; bikes are supplied. Reservations are advised.
Bus Tours. The Zürich Tourist office's daily Cityrama tour covers the main city sights; the trip lasts three hours, leaving at 11 am; it costs 49 SF. The Zürich Trolley Experience (34 SF) gives a good general idea of the city in two hours; it leaves at 9:45 am, noon, and 2 pm. The Combo Tour goes farther and includes a train trip to the top of the nearby Üetliberg. This is also a daily tour, given at 9:45 am, noon, and 2 pm; it takes four hours and costs 42 SF. All tours start from the Hauptbahnhof. The tourist office also offers a weekend Segway City Tour from 89 SF from April through October.
Walking Tours. Throughout the year the tourist office offers daily two-hour walking tours (25 SF) that start at the Hauptbahnhof. You can join a group with English-language commentary, but the times vary, so call ahead.
Top Trek. Zürich, 077/4546590; www.toptrek.ch.