What are the best activities for singles staying in Punta Cana, D.R. at the Iberostar Dominicana in October?

We are 8 single mid 20's males staying at the Iberostar Dominicana in early October (already booked, do not suggest another hotel or city) looking for the best activities and nightlife. What do you recommend?

Thanks!
Update: Can you include approximate prices?

Thanks!
4 answers 4