If it's pure, unadulterated luxury you're looking for than you need to check out Blue Diamond Riviera located in Riviera Maya, Mexico. BDR is an all-inclusive, ADULT only resort that offers various types of meal plans and spa packages (or a combination of both). I personally love Mexico because I feel like you get the biggest bang for your buck there. This would be a perfect destination for a honeymoon too!
Located 30 minutes from the Cancun airport and only 10 minutes from Playa del Carmen, BDR offers greens for golfers and is set amongst lagoons, mangroves and beachfront.... Gorgeous!
Jetsetter is currently running a promotion for this resort offering rates from $399 per night (which is a STEAL!): The Jetsetter rate includes all meals (which you'd have to purchase separately on their website), unlimited premium beverages, a welcome bottle of champagne and basket of fruit, and free local and long distance calls.