I can tell you one thing to watch out for, Cape Air is in and out of there constantly. And they act like they own the field. I would Rx that you confirm with the airport management exactly where they want you to park. Some years a go we had a dozen Mice at Nantucket; had a great time. (Pictures on BAC) But I heard later that Cape Air was bent out of shape that we took up so much space (we were in the Transient Parking) that their pilots had to actually steer during taxi.
(Though much larger, and not based there, Cape Air is the outfit that inspired the show "Wings". Mostly because the same type a/c.)
As to noise, Nantuck, though beautiful and quaint, is not the island you read about in Melville or Olde New England histories. There are serious $$ occupying that island now. And a lot of those folks don't really like us mortals.