Beach in Bali, Indonesia.
Recently, Marriott and SPG merged which, aside from having some downsides, created a few opportunities. For example, you can book high-end Marriott and SPG properties for 60,000 points per night, with the fifth night free. Unfortunately it has taken Marriott awhile (too long) to make its entire portfolio bookable online so favorites, such as the St. Regis Maldives, have not been easily bookable.
The St. Regis Maldives is now bookable with points both online and though the Marriott app. The St. Regis Maldives charges 60,000 points per night, $6 in fees per night, and $695 per trip for a roundtrip sea plane ticket. Overall availability is better than I expected.
Remember, you can “hold” the award booking and use Chase Ultimate Rewards and AmEx Membership Rewards to top off your Marriott Rewards Points account.