Philadelphia Big on Bicycling
This article & video tells the story of why Philadelphia has the highest bicycle commuter rate of any city in US of 1million+
http://www.treehugger.com/bikes/enigma-philadelphia-bike-success-story-despite-having-little-infrastructure-video.html
Having biked to work today for the first time of the summer, I can say that's definitely true. Though for me, my bike path, the Schuylkill River Trail, is pretty solid. 23 miles to my parking lot at work, and maybe 5 miles of it is shared with cars...the rest is along the scenic (for philadelphia) Schuylkill River. Added bonus: it's about just as fast (or slow, depending on how you look at it) as driving in to work.
That's a nice workout commute, 46 miles round trip, and nice that is by the river. It's funny I didn't notice many bikes when I was in Philadelphia last month, even though it was over 80 Degrees a couple of the days. Its good to learn that it is such a bike happy city. I live in one too, but we are much smaller. Great bike trails along the Willamette River and Amazon creek with wet praire and marshlands along the latter.