This is where my wife and I honeymooned a couple of years ago:
We and a handful of couples had the entire island to ourselves. The temperature/beach/water was absolutely incredible every day. The food was first class and like nothing I've eating anywhere else (they have a Western executive chef) and plentiful. Snorkelling some of the best in the world. And believe me when I tell you the staff become your best friends - some visitors go back so often that there are actually tearful farewells when they leave.
They even have a mini-island right next door that you can book. They drop you and your partner off for the afternoon (along with a packed seafood lunch). Even has an open air bed (pictures on the site) that they encourage you to "use". Trust me, fucking each others brains out in the open air in the middle of the Pacific - one of the all time great life experiences.
And it's not particularly expensive.
Only thing - no gym. But hell, it's your honeymoon.