Post in Flic en Flac

Post Office

In a light-blue case-style house across the street from the Pasadena Village complex.
Tourist Information in Black River Gorges National Park

Black River Gorges Visitors Centre

At the park's western entrance, about 7.5km southeast of Black River's Trois Bras Junction.
Tourist Information in Black River Gorges National Park

Pétrin Information Centre

At the eastern entrance to the park. Opening hours can be a little hit or miss.