In the deluxe category, I think any of the following would be great honeymoon places:
Blancaneaux Lodge, Mountain Pine Ridge -- especially the villas
Lodge at Chaa Creek, Cayo -- the honeymoon suites
Hamanasi, Hopkins -- especially the beachfront suites or tree houses
Inn at Robert's Grove, Placencia -- especially the deluxe suites
Turtle Inn, Placencia -- probably, though I haven't been here since it reopened in December
--Lan Sluder