I often refer to AAA for discounts on Hyatt hotel rates (and other hotels) but another good option is Costco. Costco has its own travel agency, Costco Travel. Like AAA, membership at Costco is required in order to get the numerous discounts and deals.
When you’re making a reservation for Hyatt, enter the code “COSTCO” in the Special Offer Code box. The standard Hyatt discount is 10 percent, which is equivalent to the AAA discount, but every once in awhile there will be some extra goodies added on. Book a reservation by June 30, 2012 and you’ll also get complimentary breakfast for two guests at participating hotels. Your stay must occur between July 1 and September 30, 2012.