Marriott customers won't be missing out on deals this summer. Marriott Rewards members will get a free night in a category 1-4 hotel after they stay three times at any of 3,000 participating hotels between June 1 and August 31.
Just like the InterContinental Hotels Group deal, your stays need not be consecutive and they can be at any participating property.
If you're not a Marriott Rewards member, you can easily sign up online. Register between May 12 and June 30. Remember, you need to redeem your free night by December 31, 2009.