SoMa is where San Francisco put the things that wouldn't fit anywhere else — the big museums, the convention centre, the ballpark — and then knitted them together with rooftop gardens and a 170-year-old oval green. This walk runs from the art downtown out to the bay, and it works rain or shine because the middle of it is indoors.
Start at SFMOMA, Botta's brick drum with Snøhetta's white wave behind, where the ground floor and the living wall are free to anyone who walks in. Cross to Yerba Buena Gardens, the rooftop lawn with the King memorial waterfall thundering behind glass, and the cluster of smaller museums around it — Libeskind's tilted blue cube among them. Then southeast to South Park, the 1850s oval that seeded the first dot-com boom; lap it, and use the cafés.
From there it's downhill to the water and Oracle Park, the Giants' field with its wall on the bay and McCovey Cove beyond. Walk the South Beach promenade north as the Bay Bridge lights come up, and catch the T-Third right at the ballpark.