ATM in La Gaulette

MCB ATM

This ATM from Mauritius Commercial Bank handles international cards and can even handle some foreign exchange transactions.
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 Visitor 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 Visitor Centre

At the eastern entrance to the park. Opening hours can be a little hit-and-miss.
Bank in Tamarin & Black River

Mauritius Commercial Bank

Has an ATM.