Cinema: Like every other city Paris has a large amount of cinemas. Most cinemas are located in the area around the Opera, Champs-Elyses, Montparnasse and the Odeon area. If you would like more information about the cinemas in Paris, check out: www.allocine.com
Theater: There are several theaters in Paris, of course, where you can see a wide variety of performances at all times. If you would like an overview of performances, take a look at the following website (French language): http://www.theatreonline.com/
Coffee shops: A part of the culture in Paris is the coffee shops. A typical French person starts the day in a coffee shop and ends the day in a coffee shop. There are numerous cafés in Paris, and they normally open early in the morning for those who want a cup of coffee and a croissant for breakfast.
Nightlife: You can find a large amount of discos, bars, casinos and night clubs for those who like to stay up in the night. It is though useful to know that they are quite strict on only letting people 18 years or older into these clubs, so if you look young, bring some ID.