Salta is a large, dusty,  bustling city but just outside is the green suburb of San Lorenzo with its large villas and leafy avenues. It's where rich Saltenos live and others go to relax, particularly at week-ends and it makes for a leisurely day out. Either get a taxi or better still a number 7 bus. They run every 15 minutes or so from the bus station, along Entre Rios and then to San Lorenzo. The fare is only 1.5 pesos, you can pay the driver but he may not have change. Get off at the end of the line, where the bus turns round and walk up the path past the kiosks to the Quebrada or Gorge. There is a ticket office there and you can go into the reserve and they give you a map to take a self guided walk around the gorge seeing all the diverse vegetation and bird life - about 2 hours. They will also lend you a walking stick -recommended as the paths can unveven - but it's a fairly easy walk. Afterwards, stroll down the hill to a restaurant (Los Andes is good), have a leisurely lunch and flag down the bus to take you back to Salta. Be warned, it gets busy on Sundays.