Check out Dhara Sport Fishing (Facebook page). Not sure if they will be in DR when you are. Be careful, there is a ton of crappy fishing excursions in DR. Don't forget that the DR is next to a big drop off in the ocean, can be really rough seas! I try this game once every 20 years then realize how much I don't like big oceans, expensive boats and trolling. The crew of the Dhara was good, boat is in great shape and the captain spoke English. We hooked one blue marlin (rugged for white) then caught and landed a single white marlin. Good luck, you have 100% of my DR fishing knowledge!