The Bay Area Rapid Transit subway in San Francisco is fast, not too costly and sometimes clean. It’s a great way to get around in a congested city and offers lots of picture opportunities, assuming some bureaucrat doesn’t apprehend you and try to confiscate your camera.

On the BART, December 23, 2006. A throwback to Leica days of yore.
Canon 5D, 24-105mm at 80mm, ISO 800, f/4 and 1/60th

Once in the city center, the magnificent hanging light display in the Hyatt Hotel is something to behold:

The San Francisco Hyatt Hotel, December 23, 2006, Canon 5D, 24-105mm, ISO 500,
1.5 seconds, f/16 at 24mm, camera on delayed action on the ground