What's the must-see thing in San Francisco?

Walk the Golden Gate Bridge from the south sidewalk on the Presidio side. The span runs 2,737 metres between the two 227-metre towers, and at pedestrian pace the round trip to the north vista point and back takes about 50 minutes. Mid-June fog tends to burn off by early afternoon. Right now the city sits in thick morning fog at 13°C with 98% humidity, which means the bridge deck will be damp and cold before noon. The wind picks up around the north tower, a steady 15-20 km/h that cuts through cotton. Bring a layer. The best photo angle is not from the bridge itself but from Battery Spencer, a former gun emplacement on the Marin headlands about 800 metres past the north toll plaza. From there you look back at the bridge with the San Francisco skyline behind it. Bus 28 from Fort Mason drops you at the south parking lot. A rental bike from Blazing Saddles near Fisherman's Wharf ($35/day) is faster, but the return via the Sausalito ferry adds $14.50 and an hour.

Alcatraz needs a reservation through the official concessioner, Alcatraz City Cruises, and in summer 2026 those sell out 2-3 weeks ahead. The day tour leaves from Pier 33 on the Embarcadero every 30 minutes starting at 9am. The 9:45am boat tends to be the least packed. The ferry ride is 15 minutes across choppy water. The island smells like salt, eucalyptus, and rust. The cellhouse audio tour is narrated by former guards and inmates from recordings made in the 1980s, and it runs about 45 minutes through D Block and the solitary confinement cells where the concrete still holds cold even in August. Cost is $41 for adults. The night tour ($47) runs Thursday through Monday and is worth the extra $6. Fewer people, the sunset light through the cellhouse windows turns the peeling paint orange, and the rangers tell stories they skip during the day. If you can do one ticketed attraction in San Francisco, this is it.

Golden Gate Park is the third pick, and it costs nothing. The park stretches 5 km from the Haight-Ashbury neighbourhood to Ocean Beach, longer than Central Park and far less crowded on weekdays. The California Academy of Sciences sits near the eastern end (adults $42.75, timed entry) and puts a 4-storey rainforest, an aquarium, and a planetarium under one living roof. That said, if your days are limited, skip the Academy and walk the park for free. The Botanical Garden ($13 for visitors, free for SF residents) has a grove of 30-metre Monterey cypresses that block the wind and smell like wet wood and earth after the fog drips through. The Japanese Tea Garden, established in 1894, charges $13 and gets crowded after 11am. Go at opening, 9am, when the koi pond is still and the gravel paths are quiet.

Skip Lombard Street. The so-called crookedest street draws long car queues and pedestrian crowds for what amounts to one block of brick switchbacks between Hyde and Leavenworth. You can see it from the bottom in 30 seconds. Fisherman's Wharf is similarly overstated for first-timers. The clam chowder in sourdough bowls runs $14-18 and tastes like what it is, reheated soup in a bread container. If you want good seafood near the water, walk 15 minutes south to the Ferry Building on the Embarcadero, where Hog Island Oyster Co. serves Sweetwater and Kumamoto oysters at $3-4 each from Tomales Bay, 90 km north. The Ferry Building farmers market runs Tuesday, Thursday, and Saturday mornings. That is a better first-morning destination than anything on the Wharf.