Hey! The better question might first be deciding whether you'd rather spend your honeymoon on Ambergris Caye, or in Placencia. Placencia has larger beaches (a relative term in Belize sometimes). My wife and I like to get out and explore (walking, biking, etc.), and found Ambergris Caye bit more conducive to that. I've only visited Turtle Inn once (never stayed), and it was definitely more luxe than what I've seen at Mata Chica (and never stayed there either, but I've visited and eaten there).