I got this in my e-mail and signed up.
Link above (my personal link from Marriott) or this link here:
Long link Edited to make shorter... Click here
Let me know if it does not work.
You can potentially win one of four prizes.
These might be helpful for those that are not in the US:
France residents: http://europe.shopmarriott.com/FR/sweepstakes
Germany residents: http://europe.shopmarriott.com/DE/sweepstakes
UK residents: http://europe.shopmarriott.com/UK/sweepstakes