Of course, after doing this, I was inspired to do my 200k Brevet [1] a few weeks later. You'll notice I skipped most of the urban riding through Novato and San Rafael on that one. It's not bad, but I think I like it for nostalgic reasons: I grew up there. But the ride from the Cheese Factory [2] down into Novato, I've always found fun. It's like a nice downward grade for miles...you blaze with very little effort. I used to ride it alot when going to my mom's.
Links:
[1] https://pancake.org/bikes/routes/200kbrevet
[2] http://www.marinfrenchcheese.com/