I did different stuff like run marathons to raise money
Best marathons I ran were for the Leukemia and Lymphoma society. If you can't run they also have marathons that you could walk.
I think adcoms do realize it is hard to raise $3000 once, but if you do it 3 or 4 times they are really amazed. Atleast they were at the schools I had interviews.
I will tell you one thing...its a pain in the ass to raise that money and it really does make you feel good especially since 70% of the money you raise through them goes directly to research and patients.