When I was in college there was a ride for breast cancer that I was a part of. It was really fun and it was a really big turnout. I remember being really surprised at how many people could pack into a small downtown area. The area was beautiful though so it was perfect for a little ride.
Came here to say something smart-ass. ya'll got it covered already it would seem.
If they had a bike ride to promote the consumption of real beer man I would be all over that.
I might have to float that idea over the the good folks at http://www.camra.org.uk
Now that's a charity I can get behind!
Actually I did do a bike for cancer once, because it was for an organization that actually really helped someone close to me getting treated for caner.
I had participated before in charity events and other causes for the environment. I still have not chanced upon anything that would make me use my bike. I guess the people in my place are more into running