I will be spending the summer on Long Island again and would be happy to organize a century there. My preference, at this point, it any of the first three weekends in July.
We would be on the eastern half of the Island. My idea is a century, starting and ending either at my house there, or at Long Island Rail Road stations. The scenery could include any of the following: pine forest, duck farms, sod farms, vineyards, Long Island Sound, Peconic Bay, Atlantic Ocean beach, millionaire homes, marinas, protected wetlands, The Big Duck, Shelter Island, touristy towns, old windmills and the like, the lighthouse at Montauk Point, and a great deal more. It's not possible to squeeze all of the above into one 100 mile ride, but I could arrange a ride that covers most of it, depending on what people want to see. We could do a loop, or take the train one way... I don't know all the roads, but it's very hard to get lost on Long Island.
All riding would be on paved roads. There are no dirt roads on Long Island; only sand and asphalt. There are some topographical features the locals call "hills," but people from most other parts of the country would not recognize them as such.
It would be possible to come by train from NYC and return there by train after the ride, but from anywhere else you'd have to spend at least one night on Long Island. Therefore: some accommodation, rather spartan (camping on my lawn, that is) can be arranged.
So... who's interested?