The truest links I have played is Highland Links in Truro, Ma on Cape Cod. Whether it is a true links I will leave to those with more expertise than I. From their website:
Heralded as Cape Cod's oldest golf course, perhaps its most scenic, the Highland Links in North Truro is one of America s golf treasures, perched high along windswept bluffs overlooking the Atlantic next to the vintage Cape Cod Light. Founded in 1892, Highland recently celebrated a hundred years of golf. More than significant than its age is Highland's heritage; circumstances keep it a genuine links, as close to the Scottish tradition found anywhere in the eastern United States, with deep natural rough, Scotch broom, heath, non irrigated open fairways, and spectacular ocean views.