Paris has an extensive Metro and bus system, with a single ticket costing 1.90€. You can also rent bicycles for 1.70€ per day, or take a taxi for around 10-15€ per trip, depending on the distance from your location.
If you have more time, consider visiting the Palace of Fontainebleau, Disneyland Paris, or explore the Paris Catacombs. If you have less time, skip the Orsay Museum, Montmartre or the Le Marais district. Also, be sure to pack comfortable walking shoes, as Paris is best explored on foot.
Paris has two main airports, the Charles de Gaulle Airport (CDG) and Orly Airport (ORY). CDG is located about 23km northeast of Paris and is the main international airport serving Paris. ORY is located about 14km south of Paris and primarily serves domestic and European flights.