For two days and the first three zones, the Mobilis card is still five francs less. Paris Visite matches the Mobilis card for price at the three day mark. But for five zones and three days, the Mobilis card still costs 35 francs less than Paris Visite. An entry to a top exhibition usually costs 40 to 50 francs - or less, and if you take in two of these per day, you will not really need the transport provided by the Paris Visite card. There are advantages that go with the Paris Visite card, such as first class seats on RER and SNCF trains.
Some commercial firms offer discounts as well.
In six stops, from the Tour Eiffel to the upstream tip of the Ile Saint-Louis, the regularly scheduled 'Batobus' is a very agreeable way to see the heart of Paris and its major sights, with a minimum of hassle and a maximum of flexibility. With the all day ticket, you can get on and off as often as you please. There is a boat about every 25 minutes. The city of Paris has been trying to chase away the locally-operated tour buses, mainly by making it impossible for them to park anywhere. To their existing fleet of sightseeing buses, the RATP is adding its own roofless doubledeckers.