I have been there it was fabulous. Highly recommend you doing the Diamond Challenge before you go there if your not Diamond already, it will save you some serious dollars.
Highly recommend the diving, the reef at the resort is nice or they will take you out to some channels.
Also really enjoyed the reef fishing, they will prepare the fish you caught at the restaurant. Good value considering the fish itself would have been $50 to order at restaurant.
Also suggest asking to take the back of the house tour.
The Calamari - fresh and delicious. The Sashimi is a good value.
I hope you like tuna and fish.
There is a very good chance that you will be there with other mileage geeks as they are not super well known yet. I can think of 4 other mileage couples that were there with us.
One couple we actually knew from a conference in Chicago previously. For what its worth they had been to both Hyatt at Conrad and said the Hyatt was much better.