Re: Trout fishing on Long Island.
The Connetquiot River is well known for it's large fish. Never been there myself, but I know that you'll need to reserve a "beat" well in advance in order to fish there.
I'd suggest that you try fishing the salt instead
Connetquot River State Park Preserve Hours of Operation - NYS Parks, Recreation & Historic Preservation
Saltwater Fly Fishing Eastern Long Island, New York
The simpler the outfit, the more skill it takes to manage it, and the more pleasure one gets in his achievements.” --- Horace Kephart