This is the place where my avatar came from. Got off the bike to walk over a couple of boulders at the entry to a switchback and my plastic soled SPD shoes were useless for traction and I fell down while walking. Proud moment.
I plan to make a trip to Oakland from Sacramento. Are there any trails you can recommend that's not too far from I-80w for a XC or trail rider?
Didn't see that mentioned and more XC then Rockville. Not knocking it but you did say XC. Don't know the Vacaville place mentioned but between those 2, and Skyline, China Camp would be the best for an XC ride and for when/if the heat wave returns. 80W->Richmond Bridge->Central or N. San Pedro exits in San Rafael.