Parc de la Villette

http://goparis.about.com/od/sightsattractions/ss/parks_gallery_8.htm

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Nestled in the far north of Paris is an under-appreciated park that is at the center of the Cité des Sciences et de L'Industrie, an ultramodern complex that itself encompasses a cultural center, a concert hall, a museum, and much more. The Parc de la Villette is a great place for kids and adults to explore and offers equal parts fun, beauty, and opportunities for learning. The Parc de la Villette's multi-themed gardens, open "prairies", and cultural center, and open-air cinema area are guaranteed to provide you with a memorable day in one of the city's less-explored areas.

• The Parc de la Villette have 10 thematic and original gardens that will easily amuse both adults and kids, including:
• Bamboo garden
• Dragon garden
• Fog garden
• Mirror garden
• Wind garden
• Dunes garden

http://www.telegraph.co.uk/travel/destination/france/paris/136765/Paris-free-things-to-do.html

La Villette (15)

This modern park and museum complex reinvigorated the former abattoir district with its red follies and themed gardens. On the northern edge, the Cité des Sciences (advance booking recommended, especially during the school holidays) swarms with kids, for its interactive exhibits in the Explora display, its excellent children's section and spherical Géode IMAX cinema. South of the canal are the Cité de la Musique music museum and concert hall, Zénith rock venue and Grande Halle, last remnant of the livestock market. Numerous events include circus, theatre, a summer outdoor film festival and Jazz à la Villette in September. The park is free but there are the following charges for the museums - Cité des Sciences: Explora, €8; 6-24 years, students, over 60s, €6; children under 6, free; Cité des Enfants, children 2-12, €8. Cité de la Musique museum: €7; under 26, free

This modern park and museum complex reinvigorated the former abattoir district with its red follies and themed gardens.

Address: 211 avenue Jean-Jaurès, 75019 Paris
Getting there: Metro Porte de Pantin or Porte de la Villette
Contact: 0033 1 40 03 75 75; lavillette.fr; cite-sciences.fr; citedelamusique.fr
Open: Park: daily, 6am-1am. Cité des Sciences: Tue-Sat, 10am-6pm; Sun, 10am-7pm. Cité de la Musique: Tue-Sat, noon-6pm; Sun, 10am-6pm

2 km Chapelle'st

http://www.davidlebovitz.com/2009/04/ten-great-things-to-do-with-kids/
This is a reclaimed industrial landscape turned into futuristic park. Most of the playful park structures were designed by Bernard Tschumi with a child’s imagination in mind.