There are many resorts in the Punta Cana area including Club Med, Tortuga Bay, the Westin and your villa. Villa guests can use all the beach areas except the hotel beaches (Tortuga Bay and Westin)
Club med (to use the facilities you have to pay the day pass)
Westin you can use the restaurants there (Anani and la Brasa) but if you want to use the facilities like the pool or the hotel beach, you will have to pay the day pass.