There are many parks in the Alameda County that allow dogs off leash. Attached is a link to a list of those parks. I know some of them better than others. I also have found out about many other places from the people I meet at those on the list. Have fun.
Cheryl, it's Carmel in Sacramento, 916.341.7314. I can't find your home telephone number and I wanted to thank you for the birthday card and wish you a speedy recovery with your impending hip operation. Call me so we can chat. I still want to come and see you, take care of you if you don't have anyone and just hang-out like we used to do.