In Summer in Madrid it is polular to drive up into the Sierra for the weekends to escape from the heat of the capital. One possible destination is Rascafría , a small town where there are natural pools for fresh water swimming. Madrid is the only region in Spain lacking thermal spas however this is the best alternative. The river is divided into a number of bathing pools and as you walk upstream, the river narrows and you gradually get away from the crowds. A relaxing afternoon with friends of friends, swimming, sunbathing and having a picnic on the riverbank.