The Preston River in Western Australia offers a 26-kilometre flat-water paddle between Boyanup and Bunbury, making it a solid option for intermediate paddlers. The route is generally calm and manageable, though conditions can change significantly depending on water levels.

When the river is running close to flood level — approximately 11.1 metres at Boyanup — the character of the paddle shifts considerably. At those higher levels, the river becomes more dynamic and challenging, drawing comparisons to the Avon Descent. This makes it a useful training ground for paddlers preparing for more demanding whitewater events, though it requires appropriate skill and caution when conditions are elevated.

The put-in is at Boyanup, with the take-out at Bunbury. Paddlers planning the trip are advised to contact the Bunbury visitor centre, where staff can assist with queries and provide relevant local information.

For trip planning purposes, checking the water level at Boyanup before launching is an important step, as the nature of the paddle varies substantially between normal and near-flood conditions.