Hyatt stay certificates have been a great way to save money when the rates are high. Also, location like Park Hyatt Maldives is a bargain, in Maldivian standards, when using stay certificates ($319 per night). Only thing to remember is that the stay is not a qualifying one when it comes to Hyatt Gold Passport promotions, stay credits, or points. You will get points for any incidentals during your stay but not for the value of the cert itself.
Now, Hyatt has come up with a new Exclusive level of stay certificate that is valid at the following locations below. They haven’t, however, made it possible to buy them yet, and thus the price is unclear. My hunch is that the price will be around $450. Currently the highest stay certificate (Inspire) costs $319 per night.