**Arc de Triomphe - Couple of hours**
The Basilica of Sacré-Cœur de Montmartre
Luxembourg gardens - Couple of hours
Eiffel tower - Couple of hours
You can spend an entire day here. Things to make sure
Get one of the audio guides; they’re really great and they’re a custom OS on a Nintendo DS
Don’t enter via the main entrance. There’s another one underground that’s accessible from the metro station which has almost no wait compared to entering via the main entrance
The Tuileries Garden out the front is pretty nice, and the walk from here to the eiffel tower across the Seine is amazing