If you want to see Redwoods or just Nature and you are in San Francisco, do not, I repeat, do not go to the Muir Woods. The traffic and congestion going over the Bridge to Marin County is horrible. The woods are packed with noisy people and there is no parking. Instead go hike amongst the trees at Henry Cowell State park instead. It's in Santa Cruz and the drive is almost as lovely as the hike.