Long distance walking route - the length of the Gryffe Valley from the source of the river near Loch Thom in Greenock, to the Onyx Sports Centre in Linwood, Renfrewshire.

The website has a good brochure which gives a lot of detail on the history of the route, the villages, and some other planning information. 

https://www.rotary-ribi.org/clubs/page.php?PgID=860660&ClubID=1803

The proposed route is a crossing of Mauritius from the southernmost point (Gris Gris) to the northernmost point (Cap Malheureux). The itinerary is as direct as possible while striving to follow as many trails as possible, which is challenging since the center of the island is highly developed.