Plans are in the making for a new face on our ten dollar bill replacing Alexander Hamilton. It is reported that they are looking for a woman to replace him. My personal pick would be former first Lady Eleanor Roosevelt.
Like her uncle, President Theodore Roosevelt, she was one that never sat still and was a person of action and deeds. She visited soldiers in both World Wars. Visited homeless veterans during the depression. Championed human rights and addressed women's issue's. She even addressed racial issues like armed forces integration and even lynchings which sadly was an issue in the 1930's. She had no fear addressing it despite her husbands fear of upsetting the southern Democratic support in the south.
After the war and Franklin Roosevelt's death she continued her hard work in the United Nations and was a key figure in drafting the Human Rights Declaration. She worked so hard for this that someone in the delegation complained that they had human rights also. She quipped back, well if your speeches were shorter we'd have more time(not exactly her words but you get the idea).
Here's a quick video of her life that does more justice than what I've just written.