This is now one of my favorite loops. I have done it twice and look forward to adding some variations to it. It is perfect for a gravel bike or a mountain bike. There is a very steep climb up to the top of the ridge so an easy gear makes that more enjoyable. You do spend a tiny bit of time on the road but they are lightly traveled roads. Coleman Valley Road is a good example, narrow, but lightly traveled. Here is a link to my Garmin Data. Willow Creek Loop. I do take a sharp right hand turn right before the bottom of Old Barn Trail. It is a nice, bumpy trail that drops you off lower down Willow Creek Road.