Hyatt’s new program offers a free night: Category 1 – 4 after staying 30 nights during the year, Category 1 – 7 after staying 60 nights during the year.
Crucially, these free nights do not count towards elite status (so I hate using them!) and more importantly expire after 120 days. You don’t merely have to make a booking within that time. Your stay has to occur within 120 days of earning the night.