What is a good itinerary for Paris for a first time visit?
1. You should visit some of the attractions. A trip to Paris isn't really complete without seeing the Eiffel Tower and the Louvre2. Markets are a french institution and you have fresh produce coming in. It is fascinating walking through Belleville for example.
3. Explore the neighborhoods - there are at least a dozen neighborhoods to explore. My favourite is St Germain for its galleries, shops and cafes. It also has Pierre Herme which has flavours like creme brulee and caramel with salt butter. 
4. People watching is a great past time in Paris - find a cafe that you like or buy an ice-cream and stroll along the Seine in the Spring or Summer.
5. Check out a free festival - arts, jazz or anything else that Paris has to offer.

Some day trips that I've done from Paris are Disneyland, the factory outlets, the Champagne Region (Epernay and Reims) and Versaille 

When planning your itinerary - have your top two goals for each day and that should reduce the stress of trying to do everything and truly enjoying your trip.

Tip on restaurants:

  • Trip Advisor usually lists three restaurants close to a hotel. It's located in teh right side bar. 
  • Toptable has restaurant deals for Paris restaurants.

Walking vesrus Metro:
  • Paris is a large city and walking takes time. 
  • The 10 carnet ticket books is reasonably priced and will save you time and your feet!
Weather:
  • The summer is warm - so factor in relaxing in parks and cafes or museums and department store time to break up the hot day.
  • Winters can be cold - I remember running around in the snow one New Year's Eve. A good beret is better than an umbrella or raincoat and you feel more french! 
  • pring and Autumn can be lovely but it does rain occasionally so pack a raincoat or umbrella.