Anyone familiar with the specific route of the Holstein Hundred?

Based on the general description the website provides, it sounds like it covers pretty similar ground to parts of the Marin Century/200K/Double. But the website doesn't specify the exact roads.

I wasn't planning on doing this ride, because I'm signed up for the Tour of Napa the next day. But it turns out I'll be house-sitting in Point Reyes Station that weekend so I'm thinking about it, especially if the route is at least a little different than what I just did on the Mt. Tam Double.

So -- any info on the route from those who've done it before is appreciated!