Stay with Marriott under Sep. 30, and your trip pays off in double miles from Mileage Plus program.

Don’t think you can just waltz in the door, though: remember that in the Marriott rewards program, you need to pre-select your mileage-earning preferences. If you need to change your profile for the purposes of this promotions, go to marriott.com and modify it.

Once registered, you’ll earn six miles per dollar spent at Marriott, JW Marriott, Renaissance, Marriott Vacation Club International and Marriott Conference Centers.

You’ll earn two miles per dollar spent at Courtyard, Residence Inn, TownePlace Suites, SpringHill Suites and Fairfield Inns.