Bonjour !
I'm lucky enough to live in the biggest city of France : Paris. (ou to have visited Paris, the capital of France).
There, you can use , I think, all means of transport. There are many buses, fast undergrounds called RER. They are between trains and undergrounds (tubes). They deserve Paris and its suburbs. They are also trains leaving paris for close suburbs. Of course , the underground called "métro" is very easy to go everywhere. You have just to get used to it, and then, it's quite easy. Now, you can rent a bike : it's called the "Vélib". It's very cheap. They're available in many areas . All you have to do is select the Vélib you want, pay the time you need in a coin machine and then put it back in any Vélib area. I think it's the way it works but I might be a little wrong ! They are around 20 000 Velib available throughout the city. You can also take the boat !!!! It's called the Batobus. It has only 9 stops, and it's a little expensive. But it remains a solution in summer time if you have already done the cruise on the Seine and just want to go from one point next the river to another one further up or down.
there are also the ballabus. I kow it's a bit different but I'm not working in Paris Tourism office ! (ça c'est si ton prof a assez d'humour; sinon regarde la différence....je ne sais plus mais sûr que les 2 existent)
There are many taxis , as well. You can stop them in the street if the light on the roof is green.
There even are motobike taxis! I tried once, it's really nice. But if you're wearing a skirt or a dress anf if you are very loaded with bags, it will be difficult.
Since a little time , there are also little" cars" for two towed by a bike; but this remains fot tourists.
There is a tramway as well; for the moment , it doesn't deserve many places but it should be hopefully extended to deserve the very close suburb.
And of course, as Paris isn't so large as you may think, if you're not in a rush, you can just walk. There so many things to see, so many "cafés" where you can seat , have a drink, that you can easily walk for a long time. You never ever get bored. I've already walked from North to South of Paris, never tried from East To West. But it has to be a sunny day of course and it' more a walk than a mean of transport for a "rendez-vou"
bonne journée
