Nettbuss Møre's (http://www.nettbuss.no/sy...) blue, local buses have frequent departures from Kristiansund Trafikkterminal to the different parts and suburbs of the city. Currently, the price for a one-way ticket lies between kr 15 and kr 30, depending on your destination.
The four main island of which the city of Kristiansund is built on is also connected by a passenger ferry-system, the "Sundbåt", that carries passengers between all the four islands with departures every 20 minutes. This is also the world's oldest public transport line in continuous operation.