The Louvre: Clearly a must stop for anyone going to Paris....but I recommend hitting just one wing or area like the Roman ruins, rather than trying to do it all. Mona Lisa is there, of course...don't be surprised by the small size of the actual painting! I would also highly recommend the Musee d'Orsay -- housed in an old train station, it is filled with light and an amazing collection of Impressionist paintings.
Ile St. Louis: This is my favorite neighborhood (actually a small island) in Paris....this is where I would want to live, preferrably overlooking the Seine. This is where my husband and I have stayed on both of our trips, including the one where he romanced me just before we were engaged so it has very special memories. Have an ice cream at Berthillon while looking upon the back of Notre Dame.
Notre Dame: The gargoyles...such an architectural feat. This is another iconic Paris stop.
The Eiffel Tower: Need I say more? If this is a first-time visit, then you obviously have to see and go up the Eiffel Tower, the tallest structure in the world when it was built in 1889....but time it to arrive just before dusk so that you get to the top and have a great view of city...and then get to enjoy it light up, which it does every ten minutes, after dusk.
The Picasso Museum: In Le Marais, a quaint neighborhood of Jewish delis and great shoppingand cafes, this museum is one of my favorite stops in Paris. Picasso was a bit genius, a bit wacko, but mostly hedonistic.
Place des Vosges: This is the most beautiful, symmetrical square in Paris (Le Marais) and one can almost imagine the gentreed intrigue and liaisons that took place here. It is also home to the Victor Hugo Museum and wonderful art galleries. I like sitting in the park in the center just people watching and staring in awe at the architecture of the place.
Luxembourg Gardens: This is a peaceful spot for resting your feet or taking in an art exhibit. Children can also rent model boats and sail them. The Marionnettes du Luxembourg is also considered one of the best -- have to do that with my daughter someday soon.
A boulangerie: Dart into any Parisian bakery and it will not disappoint. Order a pain au chocolat or a sandwich -- my favorite is pain au jambon avec fromage (ham and cheese). Magnifique!
Bofinger or Brasserie Lipp: A brasserie is a must, and these two are quintessentially Parisian. Splurge on oysters and champagne and then sauerkraut. The stained glass windows, black uniformed waiters with white aprons and overflowing trays of seafood are a must see, not to mention that sitting in one of these having a late night meal makes you feel like you are REALLY in Paris, the greatest city in the world.
Shopping: Bon Marche is the oldest department store in Paris and it can be a one-stop adventure. But I like Le Marais. My favorite blouse store, Anne Fontaine, is located there. Care to pick me up a new blouse? Size 38, thanks.
What else can one say about Paris? It is magical, seductive, intriguing and a place where one can simply "be." Take le Metro...many of its stops are eye candy given the Art Nouveau tiling, etc. Walk and breath in the city, feasting your eyes on the upscale boutiques along rue Fbg St. Honore, stopping for a glass of wine at an outdoor cafe, browsing over old books at markets along the Seine... at night the boats along the Seine also cast a magical glow. For more advice, check out Gourmet (posted on my blog) or Travel and Leisure's wonderful guides to this city.