On Sundays and bank holidays a network of main roads is shut to traffic to create the ciclovia (which sounds better than ‘bike route’). It seems like the whole city is out and about, either on foot, bike, roller blades or unicycles. Those not riding are selling; hundreds of food stalls, vendors and entertainers will cater to your needs.
Start early on the Septima, (Carerra 7) and follow your nose.