Wow - thanks for all the encouragement! I can eat, and I do have a bike, so...
I'll keep my eye peeled for your ride announcements, then, and probably become the "newbie caboose"! Are they usually on this forum?
I'll also check the clubs you mentioned, aka_kim, and see what routes I can find to explore.
I'm planning on doing my 25 mile Emeryville-Richmond ride hopefully Thursday evening, but definitely on Sunday morning (maybe I'll double it - just to get ready!) I feel so inspired, and my bike's getting a tuneup today to stop the chain rubbing, which will be nice! And maybe my new terry shorts will be here by then...