My family, including my elderly grandmother, is making a special trip to San Francisco to celebrate a series of birthdays. We would like to go to one "blowout" meal, preferable French, French Fusion (French/Japanese etc.), Italian, or Seafood. Price range is not a problem, however, the restaurant should be quiet enough that we can carry out a conversation. Everybody is a very adventurous eater so please don't limit your suggestions. We will be staying in the Union Square area but can travel anywhere in the city. The East Bay is probably too far though. Thanks in advance.