I can reccommend an agriturismo:
Valle delle Gombe
Via Calti Pendice 28, Castelnuovo di Teolo (PD) Tel/Fax +39 049 9925518 http://www.valledellegombe.it/Index.htm
homemade food, products from their own organic garden
a nice restaurant with garden
Bosco della Mardigliana Via Tevere 24, Mestrino PD tel. 049 9003073 http://www.boscomardigliana.it/
I highly recommend:
Ristorante/Agriturismo Al Bosco
Via bosco, 21
Fossona di Cervarese Santa Croce
Tel. 049.9915532
Cellulare: 338.7516668
www.albosco.it
Have a look at their website and you'll see that other than being a really nice place to go and eat, it is surrounded by hectres of land with kids park and farm animals to see.
Trust me... it's perfect for what you need.
My son has his First Communion in May and we need to book a restaurant for the reception afterwards. Can you recommend a restaurant or agriturismo with good food and a garden for children to play, in Padova area or the Colli Euganei.
Many thanks
Giorgia