The stretch through Henty Road and Pile Road has some spectacular views back to Bunbury and the coast, with lots of corners winding through the valley. Recommend lunch at the Moody Cow Brewery, a stop at Gnomesville (if you've never seen it, it's an experience) and then onto Donnybrook which has a few Cafes and a Cidery. The rest of the route is mainly straight main roads through a rural setting.
MDS