The Río Cau Cau flows through Valdivia in the Los Ríos region, running alongside the Universidad Austral de Chile's botanical garden and bordering Isla Teja. The river is subject to tidal influence, producing alternating currents that reverse direction depending on the tide. Paddlers should be aware that the current encountered heading in one direction will typically be running opposite on the return leg, and this reversal becomes particularly noticeable where the Río Cau Cau meets the Río Cruces.

A commonly paddled route follows the perimeter of Isla Teja, combining the Río Cau Cau with the Río Cruces. This circuit requires paddlers to work against the current at some point during the trip, with the direction of effort depending on tidal timing. The river's banks feature distinctive riparian vegetation and active birdlife throughout the route.

Paddlers should be aware of a significant regulatory consideration: the Chilean Navy (Armada de Chile) has classified the Río Cau Cau as a restricted zone under Ordinario 12.400, citing safety concerns. Anyone planning to paddle here should consult current Armada regulations and confirm whether access is permitted before launching. There is a viewpoint (Mirador Río y Puente Cau Cau) accessible by foot near the river's bridge, which may serve as a useful reference point for orientation.