Def let me know where you're staying. March is also a gorgeous month in the city! I hope you will be doing some of the best sightseeing stuff.... walking across the GG bridge is a must, the ferry out to Alcatraz, top of the Marriott hotel for a cocktail in the sky bar, Coit Tower in North Beach, cable car from Union Square (hop out and walk down Lombard St) Fishermans wharf is a over priced tourist attraction, so it's not on my suggested list! (Although the fish down there is amazing)
I'm still writing the list of restaurants, bars, breakfast spots etc and I'll post it later for you!