Switzerland and especially Zurich has an excellent public transport system.
For travelling around Switzerland and between Zurich and Zurich Airport see SBB
For Zurich see VBZ. With a ticket for zone 110, you can reach all congress locations from your hotel. A day pass for zone 110 is available for 8.60 Swiss Francs.
Please note that parking space in Zurich is limited and very expensive. We recommend to use public transport.