Le Marais
Today, this historic district is one of the most visited in the capital, for the heritage treasures it shelters and the atmosphere. This district forms a triangle delimited by the Place de la Bastille, Republic and the l'Hotel de Ville (Town Hall). It has many mansions from the 17th and 18th centuries, converted into internationally renowned museums (Picasso Museum Paris, Victor Hugo house, Carnavalet museum, etc.). The visit of the Place des Vosges is the highlight of a stroll in the Marais, it is a masterpiece of balance and elegance. Rue des Rosiers, epicenter of the Parisian Jewish community, is also to be discovered for its atmosphere, its shops and its restaurants. Le Marais is full of fashion boutiques, gourmet addresses and even has its own department store: the BHV Marais! There are countless bars, shops and gay clubs in the Marais which makes it the largest gay district in France.
Le quartier Latin
The Latin Quarter is in the 5th arrondissement, on the Left Bank. The area’s many cafés and restaurants are laid-back and welcoming; they are filled with Parisians, students and tourists. There are several attractions to visit, among them the Pantheon, the Musée National du Moyen-Âge, the Luxembourg gardens and museum and the Arènes de Lutèce. As you stroll through the district you will also come across the Sorbonne, the best known university in Paris; the Collège de France, the Lycée Henri IV, the shopping streets Rue Mouffetard and Rue Monge and the charming Place de la Contrescarpe. The district also has popular show venues like the Paradis Latin, the Théâtre de l’Odéon and the Caveau de la Huchette.
Versailles
The Palace of Versailles or Château de Versailles was the principal royal residence of France from 1682, under Louis XIV, until the start of the French Revolution in 1789, under Louis XVI. It is located about 20 kilometres (12 miles) southwest of the centre of Paris, it is possible to go by public transport. I would recommend going there at least a haf day.
The palace is now a historical monument and UNESCO World Heritage site, notable especially for the ceremonial Hall of Mirrors, the jewel-like Royal Opera, and the royal apartments; for the more intimate royal residences, the Grand Trianon and Petit Trianon located within the park; the small rustic Hameau (Hamlet) created for Marie Antoinette; and the vast Gardens of Versailles with fountains, canals, and geometric flower beds and groves, laid out by André le Nôtre.
The gardens of the palace is a must see, you will need a few hous just to walk trough it.