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The inflatable life vests work great. I learned my lesson the hard way once by nearly drowning while snorkeling from shore at Roatan. I had decided to not use the life vest that time and was caught in a current as the tide went out. I am a poor swimmer and quickly tired while trying to get back to shallow waters. Thankfully, my wife saw I was in serious trouble and came over to help me. I was on the verge of going under when she got to me. I will NEVER snorkel without a vest again, no matter what the conditions or depth. Perfect ocean conditions can and do change quickly and can put a swimmer in trouble just as quickly.
