Need Recommendations for Union Square Eats

[2Believe]

Hi,

My husband and I are staying on Post Street with our two kids, 10 and 13. We are looking for recommendations in the area within walking distance (Breakfast, Lunch and Dinner). Food we all agree on are Italian, Mexican, and American. A couple of us like Seafood and Chinese. This is our first stay in SF as a family and I am clueless where to go. Moderately priced restaurants are preferred. Any suggestions on sightseeing would be greatly appreciate too!! We are leaving tomorrow and staying two nights.

Thanks!!