Jimmy,
I'm not much of a golfer, so to assist you I'll let some other people from Debbies Dominican Travel offer up their opinions of the campos de golf in the East / Punta Cana.
link:
www.debbiesdominicantravel.com/golf.html#east
Note: Friends of mine have golfed the area and they like the Cocotal at the Melia Resorts which would be the nearest to the Iberostar.
Regards,
PJT