I am from the Dominican Republic and i go at least twice a year. I've fished from Puerta Plata three times, Once was on a little skiff and the other two times on a charter boat. The charter guy charged us 3500 pesos for 7 hours of fishings. The boats were pretty good too, equipped with fighting chairs. I caught a few mahi-mahi's, kingfish, and one white marlin. These boats are located where the main port of the city is. Its about 4 or 5 charters there so you can nogotiate a nice price, Im gonna make a phone call and see if i can get you a number to a boat down there. Good Luck!