Overlooking the Peñalara peak in the sierra de Madrid, this recreation area in the bed of the Lozoya River includes a 4,500 m2 natural pool (river water-fed but chlorinated), an inflatable castle, green areas, a cafeteria and playgrounds. Open approximately from June 27 to August 30, visit during the week to avoid the crowds. The beautiful medieval town of Lozoya nearby is also worth a visit.