Even though Paris is a very famous destination, be careful of pickpockets. Make sure to keep your wallet and passport/id cards in a safe place. Pickpockets can be anywhere, especially in crowded places and they like to target tourists. You wouldn't want to lose your precious belongings so be extra cautious!
One of the best places to visit when you're in Paris. While you're at the Champs Elysées avenue, make sure to go visit the Arc de Triomphe, you can't miss it as it right in front of the avenue, and it is pretty big. Once again, go there during day and at night! The landscape is very different!
Metro Line 1 station Georges V
Ohhh Tour Eiffel! This is probably the whole reason why you would want to go to Paris! To get there : Metro Line 6 station Bir-Hakeim. Don't go there during the day, because the Tour Eiffel is not that pretty, but it literally transforms itself at night. Tour Eiffel goes into a blinking mode at every hour during 10 minutes starting from 9pm. So be sure, to be there on time, it will be magic!
La Seine is the river of Paris that splits the city into 2 parts. There are many bridges that link those 2 parts, it could be fun to visit all those bridges even though it takes a lot of time. Otherwise, you can take a "Bateau mouche" which is a boat for tourist. Well, if you go to Paris, you must visit La Seine because this is actually what makes Paris a romantic place!
Ever seen the movie Da Vinci code? Yes, the movie takes place in the museum Louvre. To go there : Line 1 station Rivoli. Don't expect to visit the entire museum in one day. If you are a fan of arts, make sure to plan enough time to visit this monument (maybe 2 days).