Métro could be convenient but the buses are more fun to visit Paris. You have the option of buying a pass or a ticket. The ticket has to be punched in the machine next to the driver. The ticket costs more if you buy it on the bus. So, buy a carnet of 10 tickets from the metro station and use a ticket for each bus ride. You will have to press the red request button to get off at a bus stop. Buses run frequently up to 8.30pm. Some bus routes run until 12.30 am.