I can concur that the area around Les Tipaniers is an area where many snorkel tours go. We've stayed at the hotel twice, plus we've taken ship's excursions that go to that area (sting rays.) I've also done the ship's tour sailing on a catamaran and snorkeling on Moorea. I must say that the snorkeling is not what it was 20 years ago, sadly, in the Societies. On Fakarava I just did a bit of snorkeling from the side of the road, nothing special, but something, but I'm sure you can do better than that--the Blue Lagoon is well-known, but the problem often is, are you there long enough to do it.