Just a couple of blocks away from the Hilton is Palio's, on Sacramento. During happy hour, for every 2 adult beverages you can get one of their $14-$18 pizzas for $1.
Sotto Mare on Green Street in North Beach is a decent Italian/seafood restaurant.
Just a few steps away is Golden Boy Pizza. Great pizza by the slice...real funky place.
Original Joes seems to be a popular place, and not too badly priced. Just had drinks there so far.