This is a golden moment in Cuban history—one in which the thaw has begun, but the long-isolated country has yet to be forever changed. Seeing it all now is imperative. And though a stampede of hotel chains is waiting in the wings to make a mad rush at development, there is only one surefire way to see the entire country in high luxury right now: Hop aboard the superyacht St. David (stdavidyacht.co.uk; available through Cuba Educational Travel, cubaeducationaltravel.com) for a 7-night itinerary from Havana to Cayo Santa Maria and back. The journey—which is bookended by two vibrant nights in the capital city, where passengers can soak in the local flavor at landmarks like the historic Hotel Saratoga—will drop anchor among unspoiled mangroves and coral reefs from Bahía de Cabañas to Cayo Jutías. While at sea or in port, St. David offers plenty of diversions with six staterooms, three decks, an outdoor cinema, a water-sports center, and a clubby lounge where the Cuba libres and mojitos will no doubt flow well into the wee hours.