I just learned about this great app called Charity Miles. It's available for free for both Apple and Android phones.
They have a group of Investors who have donated money and for every mile you walk or run 25 cents is donated to the charity of your choice. Biking gives 10 cents a mile. Right now there are 31 different charities to choose from. There are so many that I like I just pick a different one each time.
If you'd like to look into it here's their website: http://www.charitymiles.org/
I'm out there running or walking anyway, so it's a great way to give some money to help out others from my workout.