Today I walked the SF Crosstown Trail, a long walk from one corner of San Francisco to the opposite corner via lots of parks and greenways and trees and such. There were a few stretches of sidewalk in there, but mostly paths among trees. Some fans of trees would probably like to set up an all-greenway route across the city. But then we'd probably end up with a bunch of coyotes at Candlestick Point yipping "Well, where are we supposed to go from here, this is dumb" and nobody wants to listen to a bunch of coyotes whining so never mind that. Anyhow, the trail was fun.