You can volunteer to work with the American Red Cross. I am a Disaster Services volunteer with Red Cross. Volunteers do a lot of training so you may not be able to work directly with the Sandy disaster but there are disasters every day in your area and around the world that the Red Cross helps with.
Since I have a full time job I only work local diasters right now. I get called out when something happens in the area like a single family home fire, apartment fire, tornado destruction, or flood. We provide food and snacks to the victims and emergency workers and assist the family to make sure they have a place to stay, food, clothing, etc. It is extremely rewarding.