Another US iconic city
The city that famous with Alcatraz and the Golden Gate might have more to offer if you know what you looking for. The hilly city might be an issue for some travelers but the public transport is somehow iconic, mostly the tram and the cable car will take you around the city easily.
Insider Tip:During the high season, you might want to pre-book the ticket for certain attraction like the Alcatraz. It might sold out for a week in advance.