Paris is a walkable city, so put on your comfy shoes and explore on foot. Don't forget to take the metro or grab a taxi if you're going to be traveling a long distance. Travel time and cost depend on the method of transportation and distance traveled.
If you have more time, you can visit the Palace of Versailles or take a day trip to the Château de Fontainebleau. For a cheaper trip, skip the Moulin Rouge and enjoy a night out at a local bar or club. Don't forget to try some of the local cuisines, such as escargot and crème brûlée.