Bday Getaway For Two

Culinary Walking Tours
Great start to the morning with a walking tour of SF's Italian district. Highlights include eclectic-flavored fudge, flat-bread pizza, and olive oil tasting.
Bike Rental and Ferry Ticket
An athletic afternoon is the perfect thing to follow a caloric morning. A scenic walk from North Beach to Fisherman's Wharf, with a quick pit stop at Ghirardelli Square, leads you right to the bike rental shop. The 8 mi ride from the wharf to Sausalito, going over the Golden Gate Bridge, offers plenty of photo ops. And Bar Bocce in Sausalito is a great place to spend the afternoon.
San Francisco Night Tour
Spending the last part of the day getting to know another area of SF in a different light rounds out the adventure nicely.
I would stay at: The St. Regis San Francisco
Beautiful and conveniently located downtown.