This section of the Pacific Marine Circle Route crosses the island from Lake Cowichan to Port Renfrew and the open ocean.
You have to adjust to different things here: There are no real civilian stations for about 50km, so neither (unnatural) refreshments nor other advantages. In addition, the road is always "improved", so that in sections with gravel is expected (for me about 3 km in total).
On the way you quickly realize that there is also a lot of timber industry on Vancouver Iceland, the mountains are often bare, shade is rare especially in the direction of Lake Cowichan. The section in front of Port Renfrew is very worthwhile (see further highlights on the route).