Some of the ways to save money when visiting San Francisco is to know about the following web sites:

Goldstar:   There are fun ideas, events, reduced priced tickets on popular attractions and shows, some are free.

State of California Travel:  Gives ideas about deals in the area and in the state.

Bay City Guide: Discount Coupons to various places in San Francisco

Entertainment Book for San Francisco:  1/2 price and other discounts to places in San Francisco

Go Card San Francisco:  Discounted prices at places related to travel to San Francisco

Wine Tasting Coupons:   If visiting Napa, Sonoma or other parts of wine country, check for half priced or reduced tasting coupons when planning your wine tasting trip.

City Pass:   Discounts to Top Attractions in One Card - Visit 5 Famous San Francisco Attractions

Wharf Pass: One price pass to a choice of 15 Fisherman's Wharf tours, bay cruises and attractions. Also includes 40 discount coupons for dining, tours, parking and shopping. Good for 2 days.  

Metro Pass:  Passports are good for unlimited rides on Muni, including cable cars, 3-day and 7-day Passports are good for three or seven consecutive days.  Passports may be purchased in advance.

SF Travel Coupons: Discount coupons for bay cruises, sightseeing tours and attractions

Discover Walks: Local guides who offer free walking tours around San Francisco

San Francisco City Guides: Volunteers who offer a free tour of the city