A legendary loop around the city of San Francisco
You can modify the ride anywhere, it's especially recommended to omit the outer sunset or downtown city portion if you want to save time.
Destination Distance From Downtown
It's flat, but it's long.
Time To Complete
If you ride on the weekends, expect a lot of traffic and a longer ride.
Spring, Summer, and Fall
Winter is the rainy season, and you're likely to run into a variety of microclimates.