Bikehaus Rent anything from kiddies bikes to fully saddled tourers and tandems for a novel city tour. You'll need a €100 deposit that is returned when you give the bike back.
On weekdays the Altstadtbus (€1.10) somehow manages to squeeze its way through the narrow streets between the Hauptbahnhof and the Altstadt every 10 minutes between 9am and 7pm. The bus transfer point is one block north of the Hauptbahnhof. Tickets for all city buses (except the Altstadtbus) cost €2.40 for journeys in the centre; an all-day ticket costs €5 at ticket machines.
Car & Motorcycle
The Steinerne Brücke and much of the Altstadt is closed to private vehicles. Car parks in the centre charge from €1.50 per hour and are well signposted.