About our boats. Our 21ft welded aluminum Thunder Jets with 90 hp Yamaha 4 stroke engines and 9.9 hp Yamaha 4 stroke trolling motors are PERFECT for salmon fishing, crabbing, island exploring and whale-watching. All of our boats are equipped with touch screen color GPS navigation systems as well as all the safety equipment required by the USCG. Come explore the beauty of the San Juan Islands from the best view on the water! Island Boat Rentals, come see and let us help you.