Treat your Grandparents to a special day…spend Grandparents Day at the Oakland Zoo! See elephants, meerkats, giraffes, and much more! Visit the Coca-Cola truck for free Coke samples. Then, take your Grandparents on a train ride! Train rides are FREE for Grandparents all day on Grandparents Day. For more info call (510) 632-9525. The Oakland Zoo is located at 9777 Golf Links Road, Oakland, CA 94605.