Gentleman, there are many ways to go about a city. One can walk (I do not recommend this as one must move fast to run from the masticating animals), ride a trolley (and get passed by a bike Friday; see previous comment about walking), ride a bus (ibid), ride a Bart (works from the airport, and there are Portuguese girls speaking real Portuguese on the Bart--cowardly, cowardly I did not bed them), run (getting there, but how are you really going to see the entire city, own the cabs, own the buses, own the trolleys, impress the skaters and cyclists, ogle umteen million hot women, and feel the shade and sun in such a short time frame and carry your camera in such a effective manner?).
One can do all of these things. Or one can mount one's velociped and own the fucking streets. They don't lower the mountains here. They raise them and dare the cyclist to climb. From the mountains to the sea, I find this easy.
