Cuban beaches are the best in my opinion, but I enjoyed sighting old buildings and monuments and talking with cubans more than going to the beach.
Also the food is amazing! I ate a lot of Ropa vieja (shredded flank steak in a tomato sauce base). Yummy!
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And you can not go to Cuba and not try cigars (Habanos), Ron and coffe!
Culture of Cuba
Cuban culture is influenced by its melting pot of cultures, primarily those of Spain and Africa. After the 1959 revolution, the government started a national literacy campaign, offered free education to all and established rigorous sports, ballet and music programs. Source
