You will need to walk off the beaten track, well away from noisy trucks, if you want to have the slightest chance of spotting any of the wildlife. Trekking around Calilegua takes time and it’s a very good idea to spend a night or two in the park. Morning and late afternoon are the best times to see animals and birds by streams and rivers. A number of trails of varying length and difficulty have been hacked through the dense vegetation; ask the rangers for guidance.
The summits of the Serranía de Calilegua, marking the park’s northwestern boundary, reach heights of over 3300m, beyond which lie grassland and rocky terrain. The trek to the summit of Cerro Amarillo (3320m) takes three days from the park entrance; the nearby shepherds’ hamlet, Alto Calilegua, is certainly worth a visit. From the tiny settlement of San Francisco within the park it’s even possible to link up with Tilcara, a four-day trek; some of the organized trips arranged in Salta and Tilcara itself, including horse rides, offer this amazing chance to witness the stark contrast between the verdant jungle and the desiccated uplands.