Another CNTraveler entry:

In St Thomas, the vibrant colors of the water aren’t the same as in pictures; they’re much more brilliant and alive! Here at Sapphire Beach, there are at least seven hues of blue comprising the sparkling view over the sea. The snorkeling in this crystal water is magnificent: the coral just below the surface comes alive with beautiful creatures. The experience is both completely soothing and wonderfully breathtaking — the perfect day.