Why don't spend the money on yourself? There are plenty of rich Singaporeans, including the million dollar ministers who can look after Singapore charities.
Go everyday eat at Raffles Hotel or the most expensive restaurant in SG.
Go take a vacation, treat yourself to something nice in a expensive place like Tokyo.
Go karaoke and splash the money there on the girls.
Go GL, cheong on all the best gals in GL.
If you can't spend the money yourself, how about considering the real needy charities that help people in third world countries - Africa, India, tribesman in Laos, Cambodia, Vietnam etc.
Just some ideas. Something different.