The Beach at Cubanacan Marazul
Hotel Tropicoco's beach is referenced by professional travelers. Out of 3 publications that we tracked, 3 acknowledged the beach, like Frommer's, Lonely Planet and Oyster.
Cubanacan Marazul 
Frommer's
Lonely Planet
Oyster
Frommer's "The best feature here is a beautiful and extremely popular section of beach just across the street"
Lonely Planet "Pity the poor travelers who book this online without looking at photos first! The main (only) benefit for the terribly unfussy is the price (cheap) and the location (you could hit a big home run onto the beach from here)"
Oyster "It's right across the street from Santa Maria del Mar's beautiful beach, and offers free shuttle service to Havana (a 25-minute drive away)"
