Thought I'd make an entry about the various tourism related modes of transports around SF. There's plenty of weird vehicles around the city, with so many tourists and SF's nutty personality.

Mr Toad's tours. I don't see them much, but I really like those vintage cars.
Segway. Looks fun to use, although I have no idea how it works. Does it balance by itself or is there a mechanism to help?
Ride the Ducks, which is supposed to be an amphibious vehicle. I've never seen it in the water before though. Frankly I think it's really loud and annoying.
Go Car. It's a tiny 2 seater car with a GPS controlled tour, so you can drive anywhere you like, but like your GPS map, it will tell you the directions to tourism destinations and some background info about the places.
Double decker bus. So 5 minutes ago.
Cable cars. So last century.
Or you could rent a bike, which is pretty popular here. Probably better for traveling long distances outside the city.

There are other not so flashy modes of transport of course. Trains and busses (BART and MUNI, which are very efficient and stop practically every few blocks), taxi ( a little expensive), Caltrain (slightly longer distance train going from SF to Gilroy), or you could rent a car too.