Viator does the regular bus trip in San Francisco to show you stops from Fisherman's Wharf, Barbary Coast, Union Square, Coit Tower, Aquatic Park.
Take a walk along the beat at Crissy Field, hike the highlands of the Marin Headlands, go to Bolinas or Stinson Beach in Marin.
Take the boat to Alcatraz or just under the Golden Gate Bridge.
Visit the DeYoung Art Museum, the Legion of Honor Museum, The Steinhart Aquarium and Golden Gate Park.
Shop in Chinatown, go to dinner in Japantown, enjoy Italian in Northbeach.
Rent a car and drive to Napa/Sonoma and go visit our wineries. about 8 years ago
buy the 50 walk in SF cards http://www.amazon.co.uk/San-Francisco-Adventures-Foot-Walks/dp/081184563X/ and explore the cards that sound interesting. you could easily do half (or more) in 3 days. about 8 years ago
I've just got back from San Fran:
- if you are looking for a nice place for breakfast away from the hotel try Mama's on Washington Square:
http://www.mamas-sf.com/ It was brilliant. It was recommended to me by another member on here and it didn't disappoint. There is a line to get in even on weekdays. I had the chocolate cinnamon french toast, delish
- Go and see the painted ladies ( the houses from the 80's sitcom full house) they're on just about every post card
- Catch a cable car after dinner to Ghiradelli Square and have some of their amazing desserts. The strawberry malt shake is probably the best I've ever had.
- Go and see Yosemite NP we even saw a bear!
- Go shopping a Macy's if you are an international traveller you can get a 10 percent discount card from their service desk on either level 6 or 7... about 8 years ago
Hire bikes and cycle over the Golden Gate Bridge to Sausalito. There is a hamburger joint in the main drag that is only about 3ms wide and has the BEST hamburgers. There is usually a queue but there is a pub next door that you can order a beer from, sit there and they will bring your hamburger to you. After a stroll around Sausalito take the ferry back.
Visit Alcatraz (book in advance) - it wasn't something that I thought I would be interested in but did it on the recommendation of a friend and loved the derelict buildings, the audio commentary and the atmosphere.
We joined a tour to Nap/Sonoma booked through Octopus travel and went on a mini bus with only 6 others. It was interesting to see the wine country and just the travel there and back was worth it. about 8 years ago