The center of Paris is not huge. The places to visit are quite grouped together.
Our advice: avoid the car!!
Very complicated traffic,
Parking only in car parks
To get around, we advise you:
1- walking (yes!)
2- the metro
3- Cycling: Vélib, cycling apps (Lime, Doot, Pony, etc.)
3- the bus (but it is quite complicated to know the bus lines)
4- taxi, or Uber, if there are many of you.
The metro: Find the map here
Single tickets (€2.15) are often the best solution.
Several other prices, but it’s complicated to understand : you will have to inquire at a point of sale offering the Navigo service.
Navigo day package: €8.65 per day, unlimited number of trips!!
Navigo Liberté+ (zone 1 only): advantageous solution,
Visit package (1, 2, 3 or 5 days) price: €13.95 zone 1 to 3 for 1 day, valid if you make at least 7 trips per day