Spend $300 in one or more transactions online or at the hotel.
Offer valid for bookings made directly with Hyatt Hotels or online at www.hyatt.com for stays in Australian properties.
Payment must be made using your eligible Card by 31/12/2017 in order to be eligible for the offer. Incidental spend, such as at hotel restaurants, during your stay is eligible if charged to your room and paid at the hotel front desk upon check-out.
Manual link: https://www.americanexpress.com/au/network/shopping/doe-offe…
Staying at Hyatt not my kind of thing but one may be able to buy gift vouchers and use it for food (at 25% off)? I did a similar thing with Hilton.