There are several good organizations where reservations may be donated - like Make-A-Wish and ( DIS sponsored ) Give-Kids-The-World, but I'd check with your tax advisor before assuming the donation would be tax deductible. You might look into renting your points and then donating the proceeds (tax deductible) to one of these great organizations. In addition, time is running out for week-long stays between now and the end of January.
Good luck!