Classic San Francisco
Watch the historic in-room TV program about the hotel. Great historic perspective of one of California's historic hotels. I've stayed at this hotel more than any hotel in the world (300+ Nights over my lifetime).
Get a room in the "Historic" wing overlooking Union Square. The 21-series, 10-series, and 34-series rooms are the best (1221, 1021, 1121, etc.). Also the Jr. Suites are the 05- and 01-series if you want a separate small room for whatever reason. Chairman's Suite is like living in a two-story house - "off the hook" classic.
Gym is now 24/7 and has a steam room. Excellent shoe shine man with character in the lobby next to gym.
This is real San Francisco, great location for shopping and financial district. Be ready for beggars on the street asking for change - although they are pretty harmless.