General park information website in Italian with addresses:
www.corriere.it/vivimilano/sport/

Viale Argonne Park
East of Piazzale Susa
Open trampolines, carousel, basketball court, bocce court

Piazza Aspromonte
near Piazza Loreto
Playground with slides and monkey bars

Boscoincitta
Via Novara, 340
Summer hikes are organized for children 5-13 by Associazione Italia Nostra
tel. 02 4522401

Piazzale Baccone
Via Morgagni
Playground with climbing structure 

Piazzale D. Chiesa
Climbing structure for older children

Via Ciceri Visconti
South from Piazzale Martini
Swings, and a climbing structure

Crocetta
West side of Corso di Porta Romana and behind an elementary school
Climbing structure, slide and teeter-totter

Parco Forlanini
Between the Tangenziale and Linate
Lots of grass and Saini Sports Center

Piazza Frattini
Corner of Via Lorenteggio and Bellini
Swings, slide, climbing equipment

Via Gian Galeazzo
East of Porta Ticinese
On the south side there are swings and a slide.  On the north side there is a teeter-totter and a roundabout

Giardini Publici - Oldest park in Milan
Corso Venezia
Mini train,  pony rides, bumper cars, merry-go-round, pond with fish and ducks, puppet shows on Sundays
http://www.ciaomilano.it/e/sights/giardini.asp

Piazza Giovanni XXIII
East of Via Vicenzo Montiand at the west end of Via Massena
Wooden climbing structure, bridge, and slide

Parco Sempione - large park with great children’s playground and good for jogging
http://ciaomilano.it/e/sights/

Idroscalo - large park
Viale dell' Idroscalo
great for family bike riding (bike rentals available), skating, and small artificial lake used for water sports with many snack bars where kids can swim and sunbathe
tel. 02 7560190
http://travel.yahoo.com/p-travelguide

Piazza Insubria
Large fenced in playground with equipment

Lambro
Via Feltre
- a large park with a river, waterfall, soccer fields, a great area for mountain biking, restaurants and bars in the park
 
Piazzale Libia
Slides, teeter-totters, space for biking and playing soccer, outdoor bar

 
Largo Mariani d'Italia
Corso XXII Marzo
Wooden climbing structure, swings, slide and merry-go-round

Lido di Milano
Piazzale Lotto, 15
Large park near Lotto metro stop
Tennis courts, gyms, open air pool, playground, mini golf, roller skating
tel. 02 39266100

Milano Due
End of Via Feltre and Viale Turchia
Slides, tunnel, swings, climbing frames

Milano Tre
Follow Via Chiesa Rossa to Milano Tre
Playground, slides, climbing frames, duck pond

Monte Stella
Near San Siro on Via Sant'Elba and Via Terzaghi
Climbing, ample space to run, trampoline park

Pagano 
Via Burchiello and Pallavicino
Trampolines, two playgrounds, climbing blocks

Quadronno
Via Quadronno near Porta Vigentina
Wood climbing structure, slide, soccer field, basketball court

Parco Ravizza
Via Bocconi near Bocconi University
No equipment but great space for biking and playing

Rotonda della Besana
Corner of Via Besana and Viale Regina marherita
Inside circular building there is a clean garden where children can play ball
No equipment

San Lorenzo
Via Pio IV Piazza della Vetra
In the park behind Basilica Sa Lorenzo
Great playground with equipment and sandy area

SNAM Sports Complex Playground
Via Cavriaga, 4 (San Donato Metro stop)
Privately owned and open to the public
circular slide and climbing bridge, swings,  sandbox, playhouses, ponds with ducks and swans, two huge outdoor pools, good place for cycling and picnics

Solari
Via Solari and Cogni Zugna (Agostino metro stop)
Nice playground with swings, slides, recently remodeled

Piazzale V. Cuoco train engine
Via Monte Cimone
An old train engine is set in the grass near Piazzale V. Cuoco

Trenno
Via Ippodromo
Huge park east of San Siro
Picnic tables, stables for riding, running paths

Villa Reale
Via Palestro, 16
Enclosed park good for toddlers, pond with ducks and fish
No equipment

Mini Golf Adventure
Via Arcangello Corelli, 38
tel. 02 702 0806
www.minigolf-adventure.it