Walk the  Golden Gate Bridge.

Stroll along the  Embarcadero from the baseball stadium to Levi's Plaza, then up the hill to see the murals in the lobby of  Coit Tower

Walk from Powell and  Market Street through  Union SquareChinatown, and  North Beach (maybe even all the way to  Fisherman's Wharf if you have the legs for it) and then take the cable car back. (Or start from Fisherman's Wharf and work your way back.) 

On a rainy day, Visit the Exploratorium , a hands-on science museum with loads of exhibits and activities for visitors of all ages. The museum is located in the Palace of Fine Arts, a gorgeous structure inspired by Roman and Greek architecture. The Palace was originally constructed for the 1915 Panama-Pacific Exposition, and was rebuilt in 1965.

EAT! This is a foodies paradise, so whenever you're here, eat something unique every day, and different from what you have at home. Include one world-class restaurant, and sprinkle in small neighborhood joints that are one- of a-kind experiences.  

Grab an Irish coffee at the  Buena Vista Cafe (across from the  Cannery) at twilight and enjoy the view. 

Catch a bus to the top of the  Twin Peaks (no 37 from  Castro) then walk the rest of the way for the best view of the city.  

Alcatraz. A MUST attraction and one of the best views of San Francisco. You should buy tickets a week in advance or even earlier.  During the summer season, the line for tickets can be very long, and it is not uncommon for the tickets to be sold out for several weeks.  Buy tickets online through  www.alcatrazcruises.com.

Take the ferry to  Sausalito. Walk over to the No-Name Bar, ask for the owner Al, smoke a cigar on the back patio with him and an assorted collection of patrons that range from boat scrubbers, film directors, federal court judges, and of course millionaires. Best time would be around 6:30pm on a Thursday. Chess players are always welcome. 

Meet real San Franciscans during fun and free walking tours. Get to see the side of San Francisco that only locals know and that most tourists miss. From civil war generals to secret tunnels, those tours are sure to show you a side of the city you’ve never seen before. time and meeting points here.

Walk--go for a nice delicious loooooong walk in the city. Start around Union Square, up Powell street (make sure you stop at some of the shops you pass by) wind your way up to  Nob Hill, come down the hill through Chinatown and end up in North Beach.  

If you're a maritime history buff, the Maritime Museum at Fisherman's Wharf and the Balclutha anchored there. 

For arts fan, do not miss the Pan-American Unity Mural, the last and largest of the murals painted by Diego Rivera in the United States. The Mural is an incredible 74-foot long piece was painted for the 1940 Pacific Exposition and is located in the SF City College district.

 

Walk the Greenwich Street steps. Look for parrots. 

See the  Musee Mecanique while at Fisherman's Wharf. This attraction of old mechanical games and displays was saved when it was evicted from the Cliff House!

Walk the labyrinths at  Grace Cathedral on  Nob Hill.

Don’t forget to watch the Sunset at Ocean Beach . If you’re there early, watch the surfers brave the cold Pacific Ocean and in the evening catch a glimpse of the setting sun.  Summer and early fall are the busiest times of year, but you can see the amazing sunset year round- just make sure you bundle up in the winter.

 

 

** Note:  The original information for this thread came from the following forum thread:

http://www.tripadvisor.com/ShowTopic-...