Last Friday, my group at Microsoft and I did a community service project as part of the Day of Caring event. We rebuild a trail that's used for tours and childrens' camps.
Also, we went a step further and made the trail wheelchair accessible; aparently that particular area sees 1 or 2 people in a wheelchair each year. It's kind of neat that we can make it possible for them to do something that they would normally be unable to do in life.