I got this from the Marriott site:

Spend a Friday or Saturday night at participating Marriott® or JW Marriott Hotels & Resorts® this fall, and you’ll get a $100 Bonus Bucks coupon good toward a future two-night paid stay. You'll also get up to $50 off a Hertz rental ($10 each day you rent for up to five days.)

– Over 300 breath-taking destinations for you to
choose from
– Stay from 10/2/09 through 12/13/09
– Bonus Bucks coupon valid between 1/1/2010
and 3/31/2010
– Hertz voucher valid between 10/23/2009
and 3/31/2010

Book by November 22, 2009.

Reservations
Be sure that promotional code V12 appears in the Corporate/Promotional code box when making your online reservation, or call 1-800-228-9290 in the US and ask for promotional code V12. For toll-free numbers outside the US please click here.

Terms and Conditions

Offer valid for weekend stays, Thursday through Sunday, October 2 through December 13, 2009 at participating Marriott® Hotels and Resorts & JW Marriott® Hotels and Resorts in the U.S. and Canada. Stays must be booked September 29 - November 22, 2009. Must stay over a Friday or Saturday night to receive the offer. Guests will receive one $100 Bonus Buck coupon for a future two-night minimum stay and one Hertz rental car voucher with a value of up to $50 per stay. Stay for Breakfast rate includes breakfast for up to two adults and children age 12 and under. Offer not applicable to groups of ten or more. A limited number of rooms are available and black out dates or other restrictions may apply. Must reserve promotional code V12 in order to receive offer. A stay is defined as nights spent at the same hotels, regardless of check-in/check-out activity. Must be a registered guest to receive offer. Limited quantities available while supplies last. No rain checks or substitutions will be issued. Void where prohibited. Visit www.marriottweekendbonus.com or call 1.888.MARRIOTT for complete offer terms and conditions, including Bonus Buck coupon and Hertz offer terms and conditions. © 2009 Marriott International, Inc. For additional Terms and Conditions, click here.