Montmartre

http://www.theguardian.com/travel/2013/may/10/paris-with-kids-family-friendly
To visit Montmartre, we begin at the Abbesses metro station instead of Anvers, the one tourists typically use. Kids enjoy Le Mur des Je t'Aime, an enormous tiled mural with the words I Love You written in 250 languages. It's tucked into the easy-to-miss Square Jehan Rictus on the north side of Place des Abbesses.
http://www.lesjetaime.com/english/
 

Chapelle 2 km

If hungry, stop at Coquelicot at 24 rue des Abbesses a cafe with a generous terrace where hot chocolate is served in bowls, the way it's drunk at home in France. On the menu are bread and brioche smothered in butter and homemade preserves, artisan yoghurts, eggs, fresh juices and light lunches.

We walk through the Passage des Abbesses and up four intimidating flights of stairs, or alternately up stair-less rue Ravignan, a little further up. On our way towards the white domes of the Sacré-Coeur, we pass through picturesque Place Emile Goudeau, where Picasso, Matisse and Braque once lived.

I offer my girls a choice of playgrounds: compact Square Suzanne Buisson or impossibly romantic, tiered Marcel Bleustein-Blanchet, better-known as Parc de la Turlure. We pause to watch the artists on Place du Tertre then wind our way to the basilica's main plaza to take in the impressive vista. Then it's time to descend the hill towards Anvers station for a metro to Buttes-Chaumont.

Parc des Buttes-Chaumont is a magical park with rocky buttes, sweeping trees, a mysterious grotto and the curious Temple de la Sibylle, mounted high atop a peak in the middle of the lake. The temple is accessed by two bridges; kids can channel their inner Indiana Jones to cross one 21m above the water or opt for the lower-lying suspension bridge. Buttes-Chaumont has a carousel, several playgrounds, a puppet theatre and picnic-friendly lawns. 
http://en.parisinfo.com/paris-museum-monument/71468/Parc-des-Buttes-Chaumont
Entrance to the Buttes-Chaumont park is free, but there is a charge for access to the island by boat.
from 30 September to 30 April: 7am - 8pm.





https://www.flickr.com/photos/rbpdesigner/4882846683 
Montmartre Funicular 

http://travel.nationalgeographic.com/travel/city-guides/free-paris-traveler/

In the shadow of the Sacré-Coeur basilica and near where Picasso lived and worked, Montmartre's Place du Tertre square is a lively spectacle teeming with aspiring artists selling souvenir-ready artwork and drawing tourists' portraits.