I did spot these refurbished World War II amphibious boat/car thingee. Yes, I highly recommend going this route if you need a quick 80 minute review of San Francisco in general.
Of course, there are lots of other options like the Segways, electric bikes, and go-carts if you have more time.
San Francisco Duck Tours - Experience San Francisco’s newest attraction and
a better way to see San Francisco, on board one of DUKW’s, (we call ‘em Ducks!) an original, refurbished World War II Amphibious landing craft.Bay Quackers is a fun-filled, memorable 80-min Surf & Turf Duck Tour of San Francisco and the Bay.
See North Beach, Chinatown, Union Square, Soma, McCovey Cove, San Francisco Bay, Coit Tower and more while quacking your way through the city.
You can check out BayQuackers.com here.

