The Fairmont Orchid on the Big Island for suite upgrades imho..

The Plaza, Savoy and Kea Lani offers the best value for the complimentary night certs. Plaza and Savoy offers only a limited number of complimentary night certs per month. Since your premier free night cert applies to a third night free its best used in context of your budget. Spending more means you get more out of your third night free. For flexibility of redemption, and the fact you get a suite with your complimentary night (Fairmont Category) redemption, Kea Lani edges out others.