It has been a while, but there is not much of anything to do in Punta Cana. I would take this as a positive, you won't feel like you missed anything by not straying from a layout, golf, eat and drink vacation.
Another thing I liked about Punta Cana was it is a little airport just for the tourists so you land, get you bags and 20 minutes later it is cocktail time at the resort - no long bus/cab rides like you can get in some other destinations (Playa for example).