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Here are the Terms and Conditions from Discover's page:

* Certificate is good for $100 off a two-night stay at participating Hyatt Hotels & Resorts.

Restrictions apply, please see Hyatt Hotels & Resorts Terms and Conditions for details.

"Terms and Conditions: Offer valid for: This Certificate is valid for a total of $100 off a consecutive two-night stay at participating Hyatt Hotels or Resorts listed on this Certificate. Certificate is not valid when quoted or paid room rate falls below $120 per night at most participating Hyatt Hotel or $180 per night at participating Hyatt Resorts and the following hotels: Grand Hyatt Atlanta, Hyatt Regency Coral Gables, Hyatt Regency Fisherman's Wharf, Hyatt Regency Harborside, Grand Hyatt New York, Hyatt Regency San Diego, Grand Hyatt San Francisco, Hyatt Regency San Francisco and Grand Hyatt Washington. Certificate is not valid at Park Hyatt Hotels or Hyatt International locations.

Stay/Usage Requirements: Reservations and this discount program are subject to availability at time of booking and must be made in advance by calling Hyatt at 1-888-628-1234 or your travel planner. When making reservations specify the offer code on the face of the Certificate. This Certificate may be applied to the qualifying rate for one guest room, single or double occupancy and does not apply to food, beverage, incidental expenses, service charges or taxes. Additional guests are subject to individual charges. No photocopies, facsimiles or duplications of this Certificate will be accepted. Offer valid only when this Certificate is surrendered at Hyatt check-in. Refunds will not be issued for previous stays. Individual hotels may restrict specific room accommodations for which discount is valid. This Certificate is not valid in conjunction with other promotional or discount programs, Gold Passport or other frequent flyer awards or certificates, group travel, tour packages, government rates or other special rate programs. A maximum of two (2) Certificates may be used on stays of four (4) or more consecutive nights for a total of $200 off the room portion of the stay. Date of stay is determined by the date of check-out. Back to back stays at the same location are considered as only one stay. Normal arrival/departure restrictions may apply. Blackout periods may be in effect during certain seasonal periods, special events or citywide conventions.

This Certificate is not negotiable, nor redeemable for cash or other substitutions and will not be replaced if lost or stolen or otherwise destroyed. Credit will not be issued for any Certificate that is not fully used. Gold Passport members will receive points for the applicable room charges actually paid. Participating properties are subject to change. Hyatt reserves the right to alter or terminate this program at any time. Hyatt Hotels and Resorts encompasses hotels and resorts managed, franchised or operated by two separate companies: Hyatt Corporation and its affiliates and affiliates of Hyatt International Corporation. © 2004 Hyatt Corp."