France
Use the boats on the river seine to travel the city. An easy way to travel.
Buy a RATP billet jour (day ticket) picking up a map of the Paris network and despite the excellent Metro use the bus to get out into the suburbs.
Particularly good is the contrast seen on the T1 tram from Bobigny to St Denys then take the bus to La Defense to look around (the view of central Paris is memorable).
Continue on Tram2 from La Defense the route of which hugs the south bank of the Seine to Issy - Val de Seine RER station whence you can return to central Paris by RER/Metro or by bus.
When you arrive at Charles de Gaulle airport you can get a train (RER) to the city centre. There are big queues for people buying tickets however there are automatic ticket dispensers. The only problem is that these machines only accept credit/debit cards with a chip or coins. The machines do not accept notes. So if you do not have a card with a chip or coins then expect to wait in a long queue for your ticket into Paris.
Charles de Gaulle airport
Travel on metro line 6, which in many places is elevated and gives good views of the surroundings. Take it over Bir Hakeim bridge to Passy station and then stroll back over the river, which gives wonderful views across to the Tour Eiffel.
Metro Line 6
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