Bay Area Hilly Hikes

Hi all, just moved to the Bay from LA, and i am really interested in exploring more. I’m wondering what the best areas are for walks/hikes? I have so far only explored in Wildcat Canyon but I want to see more. I ADORE rolling hills especially when they’re green as well as cows. Does anyone have any good recs?! Wildflowers would be a great plus too since it’s Spring now. Thanks all