I'm going out into the Gobi desert in Mongolia this summer for research. On my way back in late August I'll have a couple of days to kill in Beijing. Anybody have any good ideas for bike related stuff to do in Beijing? Are there any particullary interesting places to ride, or quick tours that can be done by bike. I won't have my bike with me, so I'll have to rent something..probably a run down utility bike of some sort. Anybody have experiance biking in Beijing?