Eat breakfast at your apartment and then set out for Union Square and Chinatown. It's the oldest and largest Chinatown in the US. Take Muni to Montgomery and find the Dragon's Gate. You'll stroll past Union Square and the tourists fighting to get on the cable cars. Don't bother lingering in Union Square. It's just a mall. You have malls at home, I presume.
While in Chinatown, find The Fortune Cookie Factory and watch how these little cookies are made. Next, find Portstmouth Square Park. Every day of the year, there are old Chinese men playing checkers here. This park has the Transamerica Pyramid as the background and is one of my favorite spots for pictures! Grab lunch at any of the Chinese restaurants around you. Some of my favorites are: Sam Wo (713 Clay St), Z&Y Restaurant (655 Jackson St), or House of Nanking (919 Kearny St, may be a wait).
Portsmouth Square Parking Garage is nearby and has decent rates or take the cable car to Powell and Clay and walk downhill. Though San Francisco’s Chinatown draws more tourists, The Richmond District (or the REAL Chinatown as we refer to it!) actually has more authentic shops and better food.