When it comes to accessibility, Paris is friendly.
It has Metro stops, public buses, even Hop-on and Hop-Off buses.
If you're not in a rush to see all of Paris in an hour, then I suggest it's best to "wander" around.
The neighborhood along the Latin Quartier side, that is St. Germain des Prés is one of nicest walks I've had.
take a pause at either Cafe de Flore or the famous Les Deux Magots,
the two cafés are always battling neck to neck though,
mais, pas faire de exagér, ( not exaggerating ) both are "always" filled with people
surtout les tourists,(especially tourists)
but once inside, it is as if, you were back in the nostalgic days.
It also used to be where famous writers used to hang out.
* where was this *
St. Germain des Prés- Paris