I am no stranger to Take Walks, having used them for Pristine Sistine in 2012 and Barcelona coming up this July. I had a last minute work trip to SF and was very happy to see that Take Walks now offers this 8 hour San Francisco in a Day tour.
As it is a relatively new tour, I ended up being the only person signed up that day - which could have been awkward but turned out amazing, all down to my tour guide Sam. He made it feel like I was touring with a friend. All the high points in the description were covered, Nob Hill, Grace Cathedral, Chinatown, North Beach, Fisherman's Wharf, Golden Gate Bridge, Painted Ladies. I really felt that I got a good overview of the entire city in a day, as promised! Lots of walking (as advertised) so be prepared with good shoes and a water bottle.
Sam is a wonderful guide, he has great energy and personality, and provided lots of fun facts and anecdotes about SF. I had a great time, and can recommend this tour without hesitation.