Trekking - Some scrambling to avoid crossing the river. There are several other points on the trail where the river must be crossed by foot, so you'll get your feet wet anyway.
Trail between Iruya and San Isidro (Argentina)
The village of San Isidro can only be reached by foot or by horse (about 8Km from Iruya). When the river is low and the weather is good, it is a very nice and easy day hike with beautiful landscapes.