The City of Love is one of the most beautiful places you could visit, and if you do decide to visit be sure to take the time to see the Eiffel Tower. You can climb it to the top, or even have a nice time at one of the restaurant in perfect view of the tower. I recommend staying until night time, when the tower lights up and you can see why Paris is called the "City of Light". While the Eiffel Tower is one of the most popular things to do in Paris, it's not the only fun thing there is to do. Another large attraction would be Disneyland Paris, or originally known as Euro Disneyland.
Speaking of popular attractions, another one would be the Notre Dame, a beautiful Gothic style cathedral that took nearly 200 years to build. It began in 1163, and was finished in 1345. Over the years it had gotten damaged, especially in the French Revolution. Since then, it has been repaired and rigorously cleaned, being completed using lasers and tiny brushes to clean it the best that it could be cleaned. They do offer free guided tours in different languages, and I'd definitely recommended taking the time out of your trip to go visit and see the tour.
If theme parts or cathedral's aren't your cup of tea, then you can always visit the Louvre, a very well known museums in the world. It was opened in 1793, which also makes it one of the oldest museums in the world. Not only is it the home of the famous Mona Lisa, but it's filled with many other works that are equally as beautiful.
There are many, many more sights to see in Paris, and it's a place you'd want to spend forever in. You defiantly won't get to see all of Paris and it's beauty in a single day, or maybe two. If you can, take the time and see all of Paris has to offer, you definitely won't regret it.