Top of the Mark is the Nob Hill landmark which for more than 70 years has drawn visitors from near and far.
http://www.intercontinentalmarkhopkins.com/top_of_the_mark/
Get there...gets packed and limited seating!
Great place to take someone who is visiting from out of town.
Great date idea - I have done it with a boy but even on my own. Just love the architecture, the classic moves, the romantic atmosphere. Perfect for those foggy summer nights in SF!