The Sequoias are near the Yosemite area and the other Redwoods are along the coast. I did a quick search and found that the Muir Woods National Monument was just north of San Francisco and within an easy drive. The main website is here. Parking here.
Parking reservations are required - I was lucky during the search for the weekend of 7/8 to find one open spot left for the afternoon! If you're ever in the area I highly recommend this park - while there were quite a few people, it was very peaceful and green while on the trails.