My sister and I only have 2 or 3 days to eat in San Francisco. We are looking for unpretentious, moderately-priced restaurants with great food, good ambiance (i.e. attention to decor and music) and interesting local people-watching, in other words, restaurants that offer all-around great dining experiences. We're from Vancouver, Canada, where we have fantastic Asian food, so we'd probably like to try other types of cuisines that may be more developed in SF than in Vancouver. We'll eat anything, as long as it's prepared well. Top 5 suggestions?