PICKPOCKETS:

Bad news travels fast, so the media is quick to pitch in on the horrors of pickpockets in Paris.  But remember, it is rare that someone gets their pocket picked in Paris.   This does not mean that you need to be less vigilant.  You're on vacation, your guard is relaxed.  The basic rules of protecting your valubles on vacation are similar to your "real " life.
        Do not keep your wallet accessible, i.e., not in your back pocket, not in your open purse or backpack.
         Don't travel within Paris or France with your passport, where a color photostat will do for shopping.
        Only have on hand the necessary cash you might need for the day, and only have one or two credit cards with you.   Leave the balance of your cash and credit cards in the hotel or room safe.  You are a tourist, and you will be in places frequented by tourists,  so that is where pickpockets congrgate.
        It is hard to NOT look like a tourist, what with cameras, maps, guide books, and white sneakers. [Nothing stands out as white sneakers on tourist's feet]    
       Don't keep your cell phone,  wallet, camera on the table at sidewalk cafes,  or in your outstretched hand, or even while strolling  along.
        France has expelled the many gypsies who were responsible for some of these activities.    One of their favorite scams was the bend down as you walked by, "finding" a "solid gold" wedding band.   They will tell you that you can have free,  but if you take it, they will hound you for a "gratuity."  Brass is brass, these are not gold.

 Be vigilant, not scared, and enjoy your vacation.