My wife and I go to Maui every January and stay at menehuni shores.  Just south are the 3 kam beaches and they have GREAT snorkelling!!!!!! 
 
It's free and fantastic.  Way south down by the old dump is another great snorkel site!!!! 
 
There are a few more I have been researching for next year. 
 
We have been to the Bahamas, belese, ect and Maui has some fantastic snorkelling... 
		
	
		
		
		
		
		
	
		
		
	
	
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