There are many kinds of parks, some of them include a playground for kids that allows parents to "have a break". But as you see in today's picture playgrounds are not good enough to match the fantasy of an improvising kid.
The park is just three blocks away from Sagrada Familia or Hospital de Sant Pau, at the intersection of carrer Industria with carrer Marina and of course there is a playground.
See Picture of Park with Kids Improvising Slide on a Google Earth Map