San Francisco, CA
Explorer | 30 pts
The trip around the outer rim starts out promising as it's a gentle uphill dirt path. From then on it's mostly road. There is also a tour bus you'll share most of the road part with. I have three small children who learned to ride their bikes this year. This trail was plenty challenging for them but I was hoping for more of an off road but gentle mountain biking experience. We did not venture up to the upper trail. I'm told that one is all dirt but it's totally flat and is much shorter than the lower trail. I'm not sure why they say this is 10mi. it's more like 5 miles on the lower and 3 for the upper.
All that said, my kids found some of the uphill portions of the trail too difficult to ride and walked their bikes. There is one fairly steep descent near the end of the trail on the road. If you have small children, you'll want to watch out for this part and make sure they keep their speed in check. If they're anything like my kids, they don't necessarily stay on the right side of the road so going down this hill fast with the bus coming up the hill could be a disaster.
All in all, it was great. We parked at Blackie's pasture and rode into Tiburon to catch the ferry. Then made the trip back. That made parking free as an added bonus. You need cash for the ferry. You can google it for rates. My kids loved it! It was challenging enough but also easy enough to make them feel like they just did something difficult but did it well! You can't really ask for much more than that. If you don't have kids, it may still be worth doing just because there are so many great views, etc. It's not really a mountain biking trip. It's a sight seeing trip. For that I'd give it 4 stars. For what I did with my family, I give it three.