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Try Nelly's bar and restaurant on the Malecon at Long Beach from Noon to 2PM except Sunday. It is my personal favorite. A good mix of Swiss,Americans,Canadians and a few assorted. There are several other bars in that area.
At night, there are more small bars in Puerto Plata, Pat's Rum Runner bar near Playa Dorada, Sam's Bar downtown, and nearby Cafe Cito and Someplace Nice, on Avenida Colon you have Anna's bar and Calor Tropical. The Expats each have their favorite places, so they are spread out.