They have a few poly boats with 15 hp motors you can rent and we used them a couple of times and got a mackerel trolling a rapala in Qantas colour on a 10-15 foot diver on a 3000 Daiwa rod and reel combo that that was 6-8 kg and we got a couple of coral trout down at the limit of the hire boat boating area using placcies on a rod 1-4 kg 2 piece snapper rod I use in the bay . They weren't big but it was fun and we took one home to the room and cooked it in the hotel room ,it was just legal and yummy . Land based I caught a couple of small trevally out near the front of the resorts on the opposite side of the harbour by walking my way around on rocks and stuff but be careful.
I used top water lures like small poppers and walk the dog type lures ,some of the spots on the island are hard to get to land based as all the good ones are on someone's property now and even a few places I got to in the golf buggy before cant be got to now as they have house on hem now . But get a golf cart and head up toward the church and you may find a way in ,I did but it wasn't an easy walk .
You can do a charter but they are busy and expensive but try your luck down the harbour you might get lucky . Matt