Put this new (opening June 2014) not-for-profit boutique inn located on a private island off the Maine coast on your radar for a discreet summer coastal experience. Maine locals joined forces to save the late-19th century Cuckold's Lighthouse from destruction after the Coast Guard deemed it no longer necessary to mariners and queued it for demolition. Local materials were donated to outfit the modern and sumptuous guest suites here, of which there are only two, which means you'll have the rugged granite island almost exclusively to yourself during a stay. Private on-call launch service to the mainland and lobster bakes with 360-degree-ocean views are a polite request away. [Rooms from $500; innatcuckoldslighthouse.com]