The surrounding pine forrest is also an essential part of the Sanatorium complex. The Paimio Sanatorium Nature trail, operated by Sanatorium Forest Association, (2,6 km) starts from the Chief Physician’s apartment, close to the parking lot of the current Preitilä kindergarten.

The trail takes the visitor to the Sanatorium’s fairytale forest, where a clear-water creek is bubbling amidst mossy rocks. The path passes a small pumping station designed by Alvar Aalto. The pumping station is still in operation and still provides irrigation water for the Sanatorium garden.

Visitors should note that, there is one difficult section on the way, right after the pumping station sign. A campfire place is along the trail. Firewood is not available on behalf of the Sanatorium.

A shorter, one-kilometer (1 km) version of the trail is available too.