For charming relaxed long-weekend getaways, it's Bermuda for people on the east coast.
Bermuda is nearby and a cheap, quick flight, is warmed by the Gulf Stream, is surrounded by wonderful coral reefs, and remains entirely British in custom and manner. There is world-class golf year-round, but in spring and fall it's perfect for everything - snorkeling, rent a whaler, tennis, motorbiking and exploring. It's not just for honeymooners and sailors. Dark and Stormys, Bermuda Fish Chowder, baked Grouper. Good stuff. Not to mention the location of The Tempest.
A marriage needs a little Bermuda sometimes.
Maggie's Farmers like Cambridge Beaches. It is understated, modest, traditional, and where the Brit royals have always stayed. Yes, you dress for dinner. It's not your Caribbean or your Hawaii.