I think Tobacco Caye is a good choice too
The lodges there are rustic and comfortable, all meals are included in the prices posted, hot water showers and "flush toilets"
Lots of fun, to do lots of nothing but snorkel, hammock and read. We love it and keep returning yearly
We'll be there again, soooooooon
There are places for cocktails, I don't wanna leave that out
You can walk to the reef, in five minutes, really !!! If you decide to go, bring water shoes. I don't recommend barefoot for in the water, but on land is fine. Quaint, quiet and you can make it what you want.