Rhodes Hall Plantation is a good option for snorkelling that does not require a boat. However, I always like to recommend Capt. Mike whenever the opportunity presents itself. He and his brother Ricky are very nice and will take good care of you. Just tell them what you think you have in mind and they will steer you in the right direction. Look for the green & yellow boat usually moored close to White Sands. Go from Coco La Palm to the water and look to the left you should see them.