lots of advice been shared over time on mosquitos and malaria pills. I asked quite a few on my first visit. Not a local, so I won't claim to know much. Your decision to use malaria pills should be carefully considered. I will tell you that if you will spend nearly all your time on the caye in late January / early February, malaria pills will be considered by most to be overkill.
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Say it 5-times fast: "I buy my BBQ and Belikins on the beach at BCs!"