Some would say for as long as you can, so bear in mind that it's a big and busy city with plenty to see and do. First-timers should consider spending at least a week there if possible, though even that might not be enough!

Which of San Francisco's neighborhoods is best for you depends on the nature of your trip. Fisherman's Wharf will meet all the immediate needs of a fleeting visit, though Union Square is a more neutral and relaxed jumping-off point for tourists. Other neighborhoods each have their own personality so it's worth putting in the research, but high-crime areas to avoid include Bayview, Hunter's Point, Sunnydale, and Visitation Valley.

"San Francisco has one of the world's most unique public transport systems. As well as buses and trains, the city is mostly mobilized by its historic cable-car network. Although newer trams do operate, visitors may want to ride one of the older ones for the novelty. Be warned though, notable routes such as the F-Market & Wharves line tend to get very crowded!
The city is also very bike-friendly,with extensive bicycle lanes and even bike lockers!"