The native California wildflowers are in full bloom at the Regional Parks Botanic Garden in Tilden Park in Berkeley. There are Lilies, Clarkias, Monkeyflowers, Poppies, Buckwheat, Larkspurs, Western Columbines, Lupines, Wild Onions, Bush Anemones, Wallflowers, a number of species of Mariposa lilies, and many other flowers in bloom.
There is also bird and butterfly activity.
See photos at:
http://naturalhistorywanderings.com/