Thanks for your replies to my post. It led me to investigate the Tranquility Bay property which sounds relaxing and off-the-beaten path.
We are travelers/divers who enjoy private adventures and snorkeling (rather than being with disturbing groups) ... so any lodging/daytrip Ambergris tips are appreciated.
PS I agree that tourists can and will damage your beautiful reef and respect your efforts to manage it. We want to be good guests. This is a big trip for my husband and I and our 3 kids (16,18, 20). We want them to remember the beauty and peace of your country, not just the hectic tourist spots.