Snorkeling

I would disagree that your target should be Playa Coral. My family and I prefer to hang our beach bags at the restaurant "Paraíso Escondido" on Playa Varadero, and walk the twenty or so paces from their property over to Playa Coral for any snorkeling, as well as just to walk along the coast.

Here's part of the view from Playa Varadero: