The Parque de los Pies Descalzos ('Bare Foot Park') was developed as a public space for relaxation. Medellín manages to develop in an innovative way, respecting the needs and wants of the local population.
My ULTIMATE list of recommendations for Medellin, Colombia, covering everything from accommodation to cafes to nightlife to day trips. Planning a trip to the city of eternal spring? You need to read this.