Parc del Castell de l'Oreneta

• Miniature railway runs Sundays and holidays, roughly 10:30–13:30, €3 a ride (cash, under-2s free), the highlight for kids
• Wooden playgrounds with zip wires and shaded picnic spots dotted through the forest
• Hilly and partly unpaved, so bring a baby carrier rather than a stroller, plus water and snacks

A wild, wooded 17-hectare park in the Collserola foothills above Sarrià, far quieter than the city-center green spaces. The big draw for kids is the miniature railway, run by volunteers on Sundays and holidays, looping 635 meters past its own little station, through tunnels, over bridges and a viaduct. There are wooden playgrounds with zip wires, shaded picnic areas, the ruins of an old castle and sweeping views to the sea. The terrain is hilly and partly unpaved, so it suits a baby carrier better than a stroller.