Breakfast at Buena Vista Cafe. At Bay end of Aquatic Park cable car line. Good food, famous Irish Coffee. Its fun to get loaded at breakfast! ^ Two or three Irish will enhance your day.
BV is also a famous singles bar later on in the day. Great view of Bay and Golden Gate. Check out the back room if there is no table seating in the main room. Back room has a view too. Take the cable car there. Very hard to park.
Go to Berkeley and walk around the campus. Really nice. You can take BART there. If you have a car, go up to Berkeley Rose Garden. Amazing view of Golden Gate Bridge.
Rollerblade or bike through Golden Gate Park. Several places on Haight St. rent the equipment.
If you go to the East Bay/Berkeley there is also a great foodie area right by the Rockridge BART station. Well worth a visit to the European style food markets and restuarants by the station.