richNYC, We (my wife & 1) stayed at Lamanai Outpost Lodge and had an outstanding experience. The people are fantastic and our guide superb. It is fairly expsenive, ~US$1,200 for 3 days ALL INCLUSIVE, but well worth it. We never had more than 6 people in our tour groups.
This place isn't for the faint of heart. You will have roomates of the 6-8 legged variety but typically harmless. There is no AC but all Cabanas have fans.
The owners are onsite on truely understand customer service. This was the highlight of our trip and will definately go back.
I didn't snorkel on AC but I dove with 2 organizations. I would recommend Amigos Del Mar, a well run operation.
Regardless, you love BZ.