Thanks my friends for all your comments. As I am allowed only one comment here by the system, I shall elaborate a lttile bit and also share my thoughts.
I know US$1 million is not much. But still not many have this much. I don't. So this is a realistic figure for the average person.
If I have the million, I shall do the first 3 things:
1. give some to deserving charities, and help others in need.
2. change my old junk (car)
3. invest part of it wisely