At participating Marriott Hotels, stay two nights and get a third night for free. That's the first such offer we've seen from Marriott this year. You must register your account by June 30 in order to qualify. To get this deal:
  1. Click here to get started
  2. click the "Promotions" tab on the left side
  3. click on "Learn More" button on the first promotion
  4. at the bottom of the page click "Join Now" to join Marriott Rewards
  5. stay twice at any participating hotel between June 1 and August 31
  6. book your free night at any of 2,900+ hotels
  7. click here for more information

Of note, you can earn up to three free nights via this promotion.