4 links
Go San Francisco Card
gosanfranciscocard.com
Sells a card that provides free admission to 30 attractions, plus discounts at shops.
Mr Treasure Hunt
mrtreasurehunt.com
Helps visitors explore neighborhoods through "urban treasure hunts" that involve solving clues.
San Francisco Convention & Visitors Bureau
sfvisitor.org
A comprehensive source for visitor info with features for leisure and business travelers, convention planners, travel trade, travel media and Bureau members.