I can provide lots of suggestions...

Dos Hermanos (multiple locations) for wonderful, enormous, and authentic breakfast burritos.

Frontier on Central for their fantastic cinnamon rolls.

Sadie's on Fourth Street is where all the locals go.

AmerAsia in Nob Hill for fantastic dim sum (better than in HKG, from what I hear).

Tons of new, great restaurants in Nob Hill and in Downtown.

PM me for other restaurants and activities! Have a great time in NM!