One of my favorite parks in Paris is the Jardin du Palais Royal, a small garden located within a Palace in the heart of Paris. It usually has less people and a really quiet and relaxing atmosphere to sit and read, or shop in some of the stores along the arcades.
Maison Kitsune is somewhat of an institution in Paris, the have a popular clothing brand, make their own CDs and now have Cafe Kitsune in the arcades of Palais Royal. They make great coffee, not to mention ice cream and matcha lattes, and they also sell Bob's juice, which is a great find for juice lovers in Paris. I had watermelon and ginger juice and a cappuccino.
