Day Tripping from Tucumán
The fertile, hilly area northwest of Tucumán is known as Las Yungas, and it's an appealing day (or overnight) trip outside the hot, busy city. The tourist office provides good information on destinations such as the reservoir of El Cadillal, which offers camping, swimming, windsurfing and a 'ski lift,' and the Parque Sierra de San Javier, a university-operated reserve laced with trails.
To the south of Tucumán, the Parque Nacional Campo de los Alisos is a tempting destination. A hilly park at the zone where the montane forest and cloud forest meets the Andes proper, there's enjoyable walking and climbing here. There's also free camping and a climbers' refugio (shelter). The park entrance is 12km beyond Alpachiri, reachable by bus from Tucumán, but more doable if you have your own wheels. The park office in Concepción, 18km before Alpachiri, might be able to help with transportation.