I fished the Morell River when I was there. Park at Indian Bridge and walk upstream, at some spots you will actually see the springs rising from the bottom of the river, I believe the local I talked to referred to this as "spring pool". There are plenty of little brook trout I wouldn't say a guide is necessary, mosquitos and adams parachutes worked good for me, but I was there beginning of July. It's a beautiful island hope you enjoy! I plan on heading back in the near future.