The Marimán rapids are in the Trancura river and you can visit them, they are about 14 kilometers from Pucón. (lat=-39.299725,lon=-71.845545)

A entrance fee of $1.000 pesos is charged and there is short trail along the river to see the rapids from varios angles.

Entrance to the rapids

First rapids seen from the trail

The trail is easy as it has been paved with wood

The second and most powerfull rapids

The Trancura river as seen from the end of the trail