Remember riding your bike to the library? It's still a favorite place to meet friends and explore. Enjoy any of the great routes to support the Alameda County Library Foundation and the new Castro Valley Library.We have great routes designed for families and riders just starting. There are also longer routes with more to explore. You'll have a great ?Tour de Valley? and support an important, lifelong library habit. Registration opens at 7:30 am. All routes are open from 8 to 9 am. Registration: General-$40. 7-12 $15. Under 6 FREEAll proceeds to Alameda County Library FoundationCourse limit: 300 riders. Helmets are required. T-shirt: $15.