If it is SPG directed, and we are talking about properties only... my ranking would be
1. St Regis Mauritius (can't comment about the other SPG properties in Mauritius because I haven't stayed)
2. Sheraton Tokoriki, Fiji
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3. Starwood Denaru, Fiji properties. Very family friendly but not a lot to see there and the beaches - meh.
I'm leaving Moorea off the chart since there aren't any Starwoods there.