Get Them Outdoors
If the sun is out and the temperature is gentle, a walk in the park smelling the flowers or watching the animals in the garden lakes could be relaxing for you as well as exciting for them, and definitely healthy for both! I'd recommend a visit to Giardini Margherita, huge and central, or Villa Ghigi, a little further from the city centre but worth visiting. If you're staying in the very centre remember that on Saturdays and Sundays the “T” area is pedestrianized and traffic free, and via Indipendenza and via Rizzoli host often puppeteers, jugglers or street artists. If your family fancies cycling you can rent a bike for you and your children at Dynamo, in via Indipendenza.