If you live in a bigger town, it is a lot easier to get sponsors. I went sponsor cruising last year for our local cancer society, we have a walk/bikeathon, just basically do laps around blocks. I found that business are really receptive to sponsoring, especially when they find out I can take a dig pic of their business front and make a sticker to put on my back for the day. I raised a little over a grand with just 5 business sponsors and 10 personal sponsors.